olivine's big naturals

Level 1: The Themes

First off: what is Olivine about? What are his values and narrative themes?

Kindness

Olivine is, at his core, someone who always tries to choose kindness. There are too many examples to fully list: he's a priest whose entire job is to be the religious and emotional pillar of a community. He helps run a church daycare for children and writes storybooks in his spare time, because the church can't justify spending donation money on toys. He teaches Eiden how to read and write Klein script. He nursed an injured rabbit monster back to health when he was at school. All three of his intimacy gifts are used for teaching children: kids' story books, wooden cards that are education tools, and paint for making picture books.

This isn't to say he's always perfect and correct. We've seen him wrongly project his own struggles onto other people in Festive Glimmer, when Olivine assumes Allie must be struggling the same way Olivine did. We've also seen him express worry over Garu and Karu in Forest Carnival, only to realize that they're much more skilled in the wilderness than he is. Olivine tries to do good, but that doesn't mean he's immune to trying too hard and becoming patronizing instead. He's aware of and self-conscious about this though, so you can easily justify ignoring it if that's convenient for the plot.

The other dark side of this is that this desire to help can easily lead into self-sacrifice. In his Idol Fest rooms, Olivine is afraid of disappointing his fans and eats biscuits that are too spicy for his stomach because they were a gift from a fan. He also can't say no when his fans mob him, leading to his date with Eiden getting ruined. He doesn't understand when Eiden tells him that it's not his fault if people feel disappointed. This comes back again in his Welcome to Elysium rooms, which focus on his difficulty saying no. Olivine tries to help someone who is supposedly stuck in debt, which leads to him and Eiden being dosed with aphrodisiacs and nearly forced into having sex in front of a crowd. Olivine is mournful of the fact that he just wants to help, but that wish comes with a price.

The most extreme example of self-sacrifice comes in chapter 12(1). After Rei tells Olivine that continuing to regulate the altar incorrectly will kill him, Olivine apologizes for doing harm. He doesn't even react to being told that continuing this way will kill him; his own life is of secondary importance to the fact that he hurt people. This comes after a lifetime of trying to repress everything he wants and is in order to do what he's told: he's used to carving out parts of himself to make space for others' demands.

TL;DR - Olivine loves helping at every opportunity he can. Sometimes that means trying to help people who don't need that help. Sometimes it means he's sacrificing something to help or is being taken advantage of. As a writer, you can play his kindness straight for fluff, or you can lean into his self-sacrificial nature for drama.

Sub-theme: Boundaries

This is sort of a sub-theme of the above. Because he's so prone to self-sacrifice, Olivine's narrative is in part about learning that he's allowed to have boundaries and about learning how to establish those boundaries.

See again: Idol Fest intimacy rooms. Eiden tells Olivine that disappointment is something people have to learn to deal with, and Olivine isn't obligated to meet everyone's expectations. He can't ignore his own feelings to keep others happy, and if he tries, the people who really care about him will be the ones disappointed in the end. His Festive Glimmer rooms are similar: Olivine and Eiden come across a father-son pair where the son is chafing under his father's overly strict expectations when all he wants is to spend time with his father. Olivine comes away resolving that one day he'll have the courage to talk to his own father, too. Ultimately, they're both about Olivine slowly understanding that he, too, is allowed to tell people when they're hurting him.

The sub-theme of boundaries goes both ways. In Elysium Olivine's rooms, he worries that he's asking too much of Eiden because Eiden is so focused on fulfilling Olivine's desires. The resolution of this, at the end of r5, is that they have a talk about safe words. Olivine learns to trust that Eiden will establish his own boundaries and will say when something really is too much for him.

TL;DR - after a lifetime of being taught that he's never allowed to say no to other people, Olivine is now learning that boundaries are good for everyone involved! Good for him!

Religion

Olivine, as a priest, obviously has religion as a central part of his narrative. Now, the game doesn't explicitly say that he had a crisis of faith, but his actions leading up to ch 4 (smearing monster cum on the altar) is absolutely subtextually a crisis of faith. This is the moment Olivine doubts what he's been told is God's plan for him and tries to break free from it. However, by the end of the chapter, his faith is reaffirmed. Olivine attributes his chance meeting with Eiden to the God of Klein, and says that his soul has been saved. Chapter 4 is Olivine's redemption arc, in the religious sense of the word: Olivine comes close to losing faith entirely, but the events that follow end up reaffirming his faith instead.

Notably, the game makes sure to mark the distinction between faith and religion. After chapter 4 Olivine's faith becomes unshakeable, but he continually struggles against the church. The most obvious example comes from Idol Fest (transcript here), where the church disapproves of idols and Olivine gets scolded by his parents for becoming one, only to find out that Tidal Wave has a lot of secret supporters within the church. Olivine's faith isn't ever in question, but he certainly is struggling against official church doctrine, as are countless other clergy members.

Aster: In truth, quite a few of the top brass at the church are big Tidal Wave of Summer fans. They acted like they were against it on the surface, but it didn't take them long to come around.

The church is blatantly hypocritical, and everyone suffers for it. Olivine resolves to change the church so that people will be freer to express and engage with harmless desires.

Another interesting thing is that there's evidence to suggest that Olivine's upbringing was unusually strict even for someone of the faith. Compare his behavior to his siblings': his siblings jumpscare Eiden and drag him into bushes, sneak out to swim in an unsafe lake (Zest rooms), and shout at actors (Olivine) during plays (Princess rooms). They're sweet, they're incredibly mischievous, and they're childish. They're allowed to be children in ways that Olivine never was. It's incredibly unlikely that they weren't also raised to be religious, so we can reasonably conclude that Olivine's situation isn't the norm for his religion. He likely had extra pressure piled on him due to his status as a clan member and the need for him to be the one who takes over the family temple.

TL;DR - Olivine's personal faith isn't the reason for his struggles - the church is. You don't necessarily need to know this if you skirt around the topic of religion, but if you do write about it, it's important to keep the distinction in mind.

Desire

Sexual desire, obviously. But also Olivine actually has a lot of desires that aren't about sex. He wants to leave the temple. He wants to travel and see more of the world. He wants to teach his younger siblings how to swim (Zest rooms). He wants to go to fairs with his friends, he wants companionship, he wants someone who sees his flaws and loves him anyway. And yes, he wants to fuck nasty. But that's only a fraction of the desires he's not allowed to have, and pretending otherwise is a huge disservice to his character.

The thing about Olivine is that he was made to repress his non-sexual desires just as much as his sexual desires. He was reprimanded for wanting to go to a fair with his friends instead of singing in a recital (Idol Fest intimacy rooms). He was told that he was never allowed to leave the temple. He had to fold origami in secret as a child (2023 birthday whispers). These are incredibly tame, non-sexual desires that Olivine still wasn't allowed to have. Having to repress sexual desires is already a very difficult thing, but Olivine's situation was even worse: he had to repress every single desire. That's a horrific way to live, and this constant repression leads to even darker desires - in his darkest moments, Olivine has desires to destroy everything because it's the only way he can think of to escape.

At the same time, his sexual desires are important. This game being what it is, his sexual desires serve as a shorthand for all his desires, sexual and non-sexual. If he's allowed to have this forbidden fruit, this ultimate sin, then doesn't it stand to reason that he's allowed to have all the lesser things as well? Doesn't that mean he's allowed to desire and have happiness?

(Read Dungeon Meshi if desires is a theme you're interested in.)

TL;DR - Olivine's struggle with desire isn't limited to sexual desire, but involves being denied non-sexual desires as well. This is less relevant if you're writing PWP, but highly relevant if you're writing anything with any amount of plot.

Combinations

Now that you have the building blocks, it's time to combine them. A lot of Olivine's struggles are about the tension between what he wants and what he's been taught; not just in the sense of religious teachings, but also in the sense of his strict upbringing.

His kindness is in conflict with a church that is at times more concerned with Looking Right than with Doing Right. His desires are in conflict with an upbringing that told him that he, specifically, was not allowed to have any. His own kindness and desire to do good can come in conflict with his desire to be free, especially in times of high stress: see chapter 4, and also his Blood Key rooms (more on that later). He's learning that he's allowed to have boundaries, but those boundaries continue to be pushed by his church and parish, and he himself doesn't always know how to enforce them.

You don't necessarily need to dig into these conflicts every time, especially if you're writing a something like a fluffy drabble. But if you want something to sink your teeth into wrt drama/angst, this is where you can start digging.

Level 2: The Thoughts

So that's what Olivine's about. But how does he think?

Self-loathing

Self-loathing, Catholic guilt - whatever you want to call it, Olivine has so much of it. This section discusses canonical self harm. Skip this if that's a trigger.

In Chimes of Darkness, we learn that Olivine still holds onto guilt from chapter 4, when he endangered countless people due to his desire to escape. This guilt is why he tries to ward off Eiden and Yakumo and infiltrate the cult alone - he views it as his duty to ensure that no one else gets hurt because of him.

In Blood Key, we learn that Olivine has a history of self-harm. The Sorcerer's Trials has rules against sex on school grounds, so between that and the pressures put on him by the church, after Olivine touches himself (presumably for the first time) he self-harms out of fear and guilt. Afterwards he continues a fucked-up cycle of giving in to sexual desire then self-harming to repent - we see a scene of a teenage Olivine praying to God for forgiveness before self-harming.

In his Blood Key intimacy rooms, we also learn that Olivine has destructive impulses. One instance comes from his time at the Sorcerer's Trials - one student accuses him of being a voyeur (because Oli did in fact watch the guy fuck), only for the rest of the class+teacher to refute the accusation by talking about how perfect Olivine is. The pressure of perfection stresses Olivine out, and for a moment, he gathers enough power to destroy the entire classroom before snapping out of the impulse.

The second instance is chapter 4 of the main story, where Olivine's desperation to escape leads him to put monster cum on the altar, leading to a lot of people being endangered by the monsters being drawn there.

The third instance comes from the aforementioned accuser coming back to declare that he and Olivine are the exact same: chasing their desires at the cost of everything else. The guy tells Olivine that even if Olivine tries to live an upright life, his dark desires will come out eventually, and Olivine comes close to believing him because of his previous destructive impulses. To prove his point, the guy threatens to kill Eiden with a spell that can only be released if the caster lifts it - or if the caster loses consciousness. The only reason Olivine doesn't end up committing murder is because Eiden manages to break through the spell and help stabilize Olivine's essence and emotions.

After the guy is arrested, Olivine admits to Eiden that he's afraid that one day he'll lose control and become the kind of person who would blindly carry out those destructive impulses. The reasons why he has those impulses doesn't matter to Olivine - the fact that he has them at all is proof that he's secretly an awful person. He is either perfect saint, in action and in thought, or he's an irredeemable sinner.

In the Welcome to Elysium ladder collection screen, Olivine has the following line:

If there ever comes a day you want to leave me... please tell me.

As far as I know, Olivine is the only clan member who not only acknowledges the possibility of Eiden choosing to leave him, but also preemptively accepts it. It's wholly unlike Quincy or Kuya having to accept that they will inevitably outlive Eiden - Olivine's quote is about Eiden choosing to leave him. There's no protest to this, no "please stay", just "please tell me". Eiden hasn't so much as hinted at thinking of this and Olivine has already made his peace with the possibility. Not only that, but Olivine apparently feels that this is something he needed to make sure Eiden knows. We see in his Elysium rooms that Olivine is afraid that he asks too much of Eiden and that Eiden might be unable to say no to things he can't or doesn't want to do. It's reasonable to extrapolate that Olivine is afraid that he's trapping Eiden in a relationship he doesn't want to be in, or that if that isn't already happening, it will happen someday. Personal interpretation incoming, but I think Olivine doesn't love himself enough to understand why someone else might love him unconditionally.

If you remember the examples of self-sacrifice from the Kindness section, I'll also say that I believe those are examples of Olivine having low self-worth. I would argue that his willingness to deny his own feelings in favor of other people's is demonstrative of him simply valuing himself as a person less than he values other people. Remember how his intimacy gifts are all for teaching kids, directly or indirectly? The gifts that make him happy aren't for him, they're for other people.

TL;DR - he hides his self-loathing, guilt, and low self-worth very well, even from Eiden, but he actually struggles a lot with it.

Curiosity

Olivine is also very curious! He loves learning! He loves reading! The Neon Carnival 2 Q&A states that his favorite place in Aster's mansion is the library. His first event, Zest for Life, features him wanting to see the Great Hunt and then begging to join it. It's also why his sex scenes are so experimental: it takes very little convincing to get him to try new things.

Personal interpretation incoming: I think it's fair to say that his curiosity is one of the driving forces behind his struggle with his upbringing. We know his father is a very strict man from Zest Olivine's rooms, so much that prior to his pilgrimage, not even the king's orders would have swayed him. We also know that Olivine's religion is very Christian-coded - very much not a religion where curiosity is encouraged. I think we can extrapolate this to mean that Olivine had a childhood where asking questions was discouraged, if not outright punished.

Putting together Olivine's natural curiosity and his strict childhood paints a depressing picture: one where questions were equivalent to disobedience, where Olivine would have been reprimanded and punished for doing the thing that children are built to do. Despite this, he remains curious all the way into adulthood. His love for learning is such an intrinsic part of him that no amount of cruelty could completely kill it.

On a lighter note, he's also a very book-smart person with a formal academic background, having attended the Sorcerer's Trials. (If you missed Chimes of Darkness, the Sorcerer's Trials is a top secret academy for training the country's best sorcerers. It is also a seminary. Don't ask me why.) During his time at the ST, he developed an original spell that could be used to see faraway places - it's unclear exactly how difficult it is to develop a spell in the game's magic system, but Olivine talks about needing to do research and testing, so it probably isn't easy. If you wanted to explore how magic works in the game's setting, Olivine and Rei are the characters who would know the most about the academic/scientific side of that.

TL;DR - despite coming from a background that tried to suppress his natural curiosity, he maintains a deep love for learning. He's also formally educated, having gone to magic/bible college as a teenager.

Loneliness

The topic of loneliness is first explicitly named in Teacher Oli's rooms, but the theme of isolation has been present since the beginning. Even though Olivine is surrounded by people, he's also been put on a pedestal by them; he doesn't allow anyone to see his true self, because he's been told his entire life that his true self is a disappointment. He's more honest with Eiden, but even then he's still hesitant to divulge his inner thoughts unless Eiden continues to prompt him (see: Blood Key's story, where Eiden gets Olivine to admit to what's bothering him by having Olivine act like he's at confessional).

Circling back to the explicit naming of loneliness in Teacher Oli's rooms. We learn that Olivine developed a spell that shows him faraway places and places he didn't even know existed because he knew he'd likely never be allowed to leave the temple to see those places. It's a spell that would seem useless to most people, but it's precious treasure in Olivine's lonely life.

Level 3: The Trauma

So. We know what Olivine's about, and we know how he thinks. But why is he like this?

Childhood

Olivine was essentially groomed from birth to become a priest. Because of his gemstone, he was raised with the expectation that he would take over his family's temple one day. His upbringing was unbelievably strict as a result.

Examples: He used to hide under the covers at night to do origami as a kid, though now that he no longer has to hide as an adult, he's lost the habit of doing origami (2023 birthday whispers). He was scolded for wanting to go to a fair with his friends instead of performing at a recital (Idol Fest intimacy rooms), something that he explicitly links to his fear of disappointing people.

It paints a picture of Olivine's childhood as one where he wasn't allowed to do Normal Children Things, like. Play. My god, imagine teeny little Olivine having to do origami in secret because he wasn't allowed to do it openly. It's origami.

I digress. Essentially, Olivine had a horribly strict upbringing in order to force him into the priesthood. Instead of rebelling, Olivine tries his best to do what he's told, but is never perfect enough to live up to those impossible standards.

Sorcerer's Trials

The following section discusses canonical self harm. Skip this section if that's a trigger.

As a teenager, Olivine is recruited to attend the Sorcerer's Trials. It's not clear what level of education the ST is (or even whether our concepts of primary-secondary-tertiary education exist in Klein), but no one bats an eye at Yakumo attending the ST as a 22yo, so it's likely closer to university than high school. Furthermore, the ST is an institute that is so secret that no letters are allowed in or out. This means that as a teenager, Olivine attended a boarding school far away from home with zero means of contacting anyone from home.

Inserting personal experience here: it's a wild experience to go from a home that actively diminishes you to an institute that simply does not care about you as a person as long as you produce results. It's not "from the frying pan into the fire" so much as it is moving from one form of cruelty to a different yet equal form of cruelty. It fucks you up in a specific way that I'm still disentangling within myself. So I can't really further explain how the ST affected Olivine, because I'm still figuring out how my extremely similar experience affected me.

But even though I can't explain the psychology of it, I can list the visible effects of it. The Sorcerer's Trials reinforced Olivine's understanding that sexual desire is something he's not allowed to have, and it kickstarted his cycle of giving in to sexual desire and then self-harming to repent for it. (See: the Self-loathing section.)

TL;DR - boarding school fucks you up.

Priesthood

Olivine took over the priesthood 3 months before chapter 4, the same time monsters start causing trouble in the area. On the first read through it seems like he starts smearing monster cum the moment he's ordained, but in actuality, he says that he took over the priesthood 3 months ago, not that he was ordained 3 months ago. We know from chapter 12(1) that the temple has multiple priests, so in all likelihood Olivine has been a priest for much longer than 3 months by the time he meets Eiden, he just wasn't the head priest of the temple.

Also, Olivine's parents left on a pilgrimage immediately after he took over the priesthood of the temple, so they're dicks.

In chapter 4, Olivine says to Eiden that he realized after being ordained that he never wanted to be a priest. However, in his R rooms, he's come to enjoy being a priest. Eiden likens it to his own experiences with his job: he did love being a designer, but not when it was his entire life. Olivine is steadfastly devout and loves serving his community as a leader, and I think he just needed to see for himself that he had the ability to walk away if he needed or wanted to. To paraphrase the theme of Welcome to Elysium, choices are only meaningful if one has the freedom to choose, which includes the freedom to say no.

Level 4: Let's Talk About Sex

I've separated this part out because I wanted to highlight Olivine's non-horny traits first. I think that a lot of the time people simplify his entire character to "lol horny priest", but if you've read this far, then hopefully you'll understand that there's a lot more to him than just that. If you skipped to this part, I am very sad. I worked hard on the rest of this.

If you follow this blog you know that I'm absolutely not one to shy away from sexualizing him, but the thing is, he's not actually a shameless slut - half the point of his character is that he has a LOT of shame! His arc is about his struggle to reconcile his desires vs everything he's ever been taught. Those desires aren't entirely about sex, but sex is still a huge component.

To write Olivine porn, it's helpful to have a vague sense of where in the timeline you are. Earlier gives you more shame, later gives you less shame - unpacking a lifetime of indoctrination takes time. Though if you don't include anything that would pin the fic to specific points in the timeline, your options are a lot more flexible. Remember: characterization is contextual to the circumstances and whom the other character(s) is/are. If you understand a character well enough, you can pull off things that might seem OOC on paper but completely make sense in context. This section is heavily dependent on my personal interpretations.

A lot of his increasing shamelessness is also deeply tied to his trust in Eiden. I don't think it's unrealistic for him to be seducing another clan member, but I do think that it's difficult to pull off him being dominant with someone he hasn't slept with before; he defaults to shysweet-sub mode when he's unsure about things. (See Elysium r2, where Olivine's shyly subby and hesitant because he's new to pole dancing.) I don't think it's impossible to have him confidently dom a clan member he hasn't slept with before, but it would take a certain amount of Manufacturing Circumstances. The paths of less resistance would be him being subby and/or uncertain even if he was the one to seduce the other guy, or for it to be an established relationship.

On the note of seduction, that also depends on where in the timeline you fall. Before Teacher Oli, he often maintains a level of plausible deniability. Think of it this way: instead of posing it as a direct question to Eiden that Eiden might say no to, Olivine structures his seduction in a way where Eiden could just pretend he saw nothing instead of directly saying no. For example, Kleinmas Oli r1-2 has Olivine giving Eiden the remote to his nipple vibrators but telling Eiden that it's a hand warmer. Eiden only figures out that it's a remote when he tries injecting essence into the "hand warmer".

In Teacher Oli's r2, Olivine jumps on Eiden after a lesson to suck him off. It's noted that Olivine's essence has been going haywire since the event story, so this is the level of boldness he gets to when he's under magically-induced horny. Gun Oli's r5 continues this forwardness, with him initiating a roleplay with Eiden and riding him. Princess Oli's rooms take it even further - he openly, publicly, and shamelessly seduces Eiden, then tells Eiden he's remorseless, so how is Eiden going to punish him? And then Elysium r5 just has Olivine fold Eiden in half, it's great.

TL;DR - Olivine has a huge range of "hesitant shysweet ultrasub" to "fold you in half dommy mommy" and where he lands depends heavily on when the fic takes place, who he's fucking, and too many other situational variables to list.

Sensitive spots

Chest (came from giving a titjob in Idol r2)

Nipples (came from nipple vibrators in Kleinmas r2)

Back (Eiden licks his back in Zest r5)

Stomach (belly button gemstone)

Dick (obvious, lol)

Anus (usually cums just from anal play. SR r5 features Olivine begging to be fucked while Eiden sucks him off.)

Kinks

Masochism (you don't need a source for this)

Exhibitionism (OG r5, Kleinmas r5, Elysium r2)

Dom/sub - he mostly subs (you also don't need a source for this), but in Gun r5 he takes charge and rides Eiden, and in Elysium r5 he folds Eiden in half in the Amazon position.

Bondage (Teacher r5)

Student-teacher, but honestly, I think Eiden gets off on this more than Olivine does? It reads more like a kink that happens to Olivine because he's a teacher more than it being something that actively gets him off. (SR r5, the entirety of Teacher Oli)

Gun play (Gun r5)

Orgasm denial/cock ring (OG r2)

Dirty talk, but to be frank, that's pretty standard for dialogue-heavy games.

Sex toys (caturbator from various 4-komas, self-made vibrators in Kleinmas r2, butt plug in Princess r2, HUGE dildo in Elysium r2)

Creampies (story H scene - he says he wants so much cum inside him)

That thing Eiden does where he makes Olivine go into detail what exactly it is that he wants from Eiden

Also he's SUPER into sucking (Eiden's) cock (Teacher r2, arguably Idol r2)

Extra notes:

Sadism: in Elysium r5, Olivine gets excited imagining what it would take to get Eiden to safe word. I doubt he's a hardcore sadist in the sense of wanting to hit Eiden, but he does seem to be interested in the idea of pushing Eiden's limits (read: wringing his cock dry).

Roleplay: Olivine seems to not be really into it. He's not against the idea, and in fact initiates roleplay in Gun r5, but he also drops character very very quickly. Idol r5 also features him protesting while Eiden tries to roleplay with him. Honesty is a recurring theme of his intimacy rooms, so it's not too surprising.

Speculation on the rare top Oli: see here. TL;DR - possible, if you Contrive the Circumstances.

Dynamics with Other Characters

Bonus round! I'm going to play it a little loose and fast and mix in a healthy amount of interpretation and headcanon.

Strangers/acquaintances: Olivine is very courteous until he's given reason not to be. He's been known to book-slap would-be gropers into unconsciousness (Neon Carnival 1). It's always played for laughs, so for a more grounded fic, it's up to you how much you want to take that seriously. On the other hand, he's also weak to pushy salespeople (Elysium r1) and easily taken advantage of (Idol r3-4, Elysium r3-4).

Eiden: Our beloved MC is the driving force behind Olivine's religious redemption in ch4, as well as all his healing in the events following. Eiden and Olivine's relationship is one of give and take; Olivine teaches Eiden to read and write, and Eiden teaches Olivine it's a good thing for him to have boundaries. Olivine supports Eiden in an unfamiliar world, and Eiden supports Olivine in discovering the fullness of what freedom can offer.

The core of their dynamic is Eiden wanting to fulfill Olivine's desires, which allows Olivine to feel like he's not being wholly selfish for having and engaging with his desires; after all, Eiden wants it too. The lifelong giver finds himself in the position of a receiver for the first time. And, eventually, Olivine learns that it's not just okay for him to receive, it's also okay for him to take - while still being mindful of Eiden's limits and boundaries.

No, really, when else have you seen a genuine conversation about safe words in BL? Olivine is one of Eiden's most openly communicative partners. He's not always perfect about it (see: Chimes of Darkness. see also: Olivine hiding the extent of his self-loathing), but he sure as fuck tries. Sometimes Eiden has to prod him to share more, but generally, Olivine is someone who Eiden doesn't have to play insane mind games with just to reach begrudging tolerance.

Eiden and Olivine's dynamic also has a component of not being completely reliant on the other. They support each other, but they each work on themselves, too. It isn't a dynamic where Eiden has to force self-improvement on Olivine against his will; to paraphrase Princess Oli's rooms, the princess in the tower was saved by her own desire to be free. It's like, you know, real life therapy. Shit doesn't go anywhere unless you're willing to put in the work.

If we're trying to argue for realism, though, there are things that are completely fine in a fictional relationship but wouldn't be great in a real one. Olivine does tend to put Eiden on a pedestal and he does externalize his self-esteem, which means that his sense of self-worth is too dependent on what Eiden says. There are also the played-for-laughs bits about Olivine threatening to book-smack Eiden for, like, refusing to get out of bed. In the grand scheme of all the game's relationships and their would-be-bad-in-real-life traits, these are pretty mild.

Aster: They don't interact much, but Aster does pull Olivine away from the creamy hot pot in Silver Miracle, so evidently they're friends! Also, sadist dom x masochist sub. Masochist sub who has a similar body type to Morvay (possibly fits Aster's type). Aster would have a great time roleplaying corrupting an innocent priest. The potential is there.

Morvay: Busty Bottoms Squared. I'm a FWB MorvOli believer, I don't care how much canon basis it does or doesn't have. They do go shopping together in Klein Star! I think their friendship is really sweet. They'd go shopping for sex toys together and kiss in the aisles. If they ever had a threesome they'd kill the third guy.

Yakumo: They share three events: Idol Fest, Chimes of Darkness, and Fanciful Capriccio. Outside of that, Yakumo, Olivine, and Edmond are often grouped together in what I affectionately term the Pokemon starter trio (red green and blue, get it?). Yakumo and Olivine are obviously good friends, and it makes sense; Olivine is a very calm and reassuring person that Yakumo can depend on. Also see this post.

Also they're both insatiable. The sex would be insane.

Edmond: Pokemon! starter! trio! Edmond and Olivine both have strong themes of duty and repression in their respective stories. They could have a very cutely chaste high society regency romance.

Quincy: Big Titty Committee. They'd get along well, I think. Olivine isn't noisy and would let Quincy just nap. Also not a lot of people could take the kind of ass destroying Quincy delivers, but Olivine would be in heaven.

Kuya: Ohhh my god. Milf on milf violence. Elevated by everything that happened in Welcome to Elysium. The unspoken solidarity of two people who have both struggled with suicidal ideation. The fundamentally opposed worldviews, and the truce built on a shared understanding that they're both looking for reasons to live. The fact that Olivine isn't afraid of Kuya and isn't someone Kuya can frighten or threaten into compliance. Near the end of Welcome to Elysium, for a moment, Olivine trusts Kuya more than Eiden trusts Kuya. Kuya going to bible study for kids.

Also the sex would be nasty. Sadist dom x masochist sub.

Garu & Karu: As alluded to in the very first parts of this obscenely long post, Olivine has a caretaker-y, borderline parental attitude towards Garu and Karu. It's something he's self conscious of, because they're grown adults who can take care of themselves and have taken care of themselves in the Dead Zone for years. Garu seems to be fond of Olivine and not offended by Olivine feeling the need to look out for him. Olivine could wrangle Karu by just, like, gently insisting on things and logic-ing Karu into it.

Also you can't tell me the puppyboys wouldn't be incredibly into tits. This is prime mommy kink potential over here. Olivine would let Karu top, if you're interested in letting Karu top.

Blade: None The Shame x All The Shame. They both like the library the most in the mansion! They're both very curious, exploratory people who want to experience everything the world has to offer. Olivine has a deep and thorough understanding of social cues and could guide Blade on that front, while Blade has an encyclopedic memory and inhuman analytical skills. They should go foraging and shopping together. They're incredibly sweet and could get into kinks you've never even heard of.

Dante: see this post

Rei: see this post

Conclusion