beyblader04

You know, "serious, deadpan gay has their heart melted by a nerdy, chaotic disaster bisexual with childhood trauma." Alternatively, "not enemies but initially on opposing sides before sun-coded breaks down moon-coded's walls and then subsequently become best friends that are closer to each other than most other people."

To start, the similarities between Lan Zhan, Cas, and Shouto:

Deadpan, cold, aloof, serious, intimidating, takes things literally 

Initially driven by rigidly-defined principles/goals before having their world view altered by the other half of their ship, which in turn causes them to become more uncertain of themselves and what they want, but recognizes that they are happier and better-off for it now than they were before

They were raised in an unforgivingly strict environment where there was no margin for error, causing them to become cold and jaded in a way that covers up the fact that, at their core, they are fundamentally kind and good in a way that they don't even realize but desperately want to be

Socially awkward introverts that hate everyone but This One Person

Come across as very intimidating but are actually very soft 

Surprisingly good with kids

Familial issues/trauma

They can also be identified as the "fell first" half of the relationship, and most likely fell within one of their first few interactions with their love interest 

Youngest siblings

Has an obsession with a specific animal (Cas likes bees, Lan Zhan likes rabbits, Shouto likes cats)

The undisputed powerhouse of their respective series that everyone recognizes as one of, if not the strongest members of the cast

Everyone thinks they're super wise and mature, but they are actually the pettiest bitches you will ever meet

Gay and entirely obsessed with This One Person

They all have small, private conflicts about allowing themselves to Feel. They were raised to compartmentalize, repress, and conceal-don't-feel; push everything down until you are perfect and untouchable. Then their love interest comes along and upends everything and finally allows them to Feel, but because they were taught to repress everything, they don't entirely know how to do that yet, so, with the help of their love interest, they slowly heal and learn how to be more human and less like the image of untouchable, god-like perfection they were raised to be (metaphorically for lwj and Shouto, but literally in Cas's case)

(I was gonna say, "they all belong to the mile-high tall club", but then I realized that only applies to lwj and Shouto because Cas is technically shorter than Dean, lol. Though, I guess you could argue that his true form (without his vessel) is taller, but, like, c'mon)

Incredibly dry, niche sense of humor that's only really funny to This One Person

Lan Zhan and Shouto both have mothers that they love, but who were forced into an unwanted, loveless marriage by their father that led them to be increasingly isolated from their children until resulting in a psychotic break that ultimately destroyed them and drove their husbands to imprison them (Rei in the mental hospital and Lan Zhan's mother in the Jingshi)

Unrepentantly earnest and blunt with their thoughts

Completely whipped for their partner

Now! To the disasters! Wei Ying, Dean, and Izuku:

Friendly, excitable, extroverted, sunshine-y/always smiling

Near-unparalleled geniuses in their fields of interest that like to experiment and test things

Childhood trauma

The powers that be have decided that they are undesirable in some way or another, that they are a waste, disposable, an acceptable sacrifice to make in the grand scheme of things. They have all struggled with feelings of worthlessness, and have all arguably struggled with self-hatred at least once in their lives, and even if they don't actively hate themselves anymore, by and large, they do not recognize that they have value just as they are, that the only value they have lies in what they can do (or sacrifice) for others. None of them have much in the way of self-esteem or any sense of self-worth.

At their core, they want to save people.

They all have themes of being different from the negative characatures that society tried to make them into.

Extremely talkative and come across as annoying to most people

Likes kids

Reckless and jump head-first into danger at the drop of a hat

Carry feelings of guilt, have a tendency to cast blame onto themselves, takes responsibility for things that aren't their fault

They want so badly to do good, and they choose to be kind in a world that deemed them unworthy of it

Good relationships with their respective maternal figures/caretakers (Dean and Izuku with their actual mothers, and Wei Ying with Yanli)

Wise-cracking smartasses that give off dumbass energy

Bisexual

Inadvertently ends up adopting a small army of children

Deflects their traumatic experiences with jokes

Has that one female best friend that is definitely a lesbian (wwx and Wen Qing, Izuku and Ochako, and Dean and Charlie)

They are the caretakers, the protectors, but they so rarely let themselves be cared for by others. Their respective love interests are some of the few people they feel comfortable being truly vulnerable with and will let take care of them

Deflects their traumatic experiences with jokes

"Oh my God, (Cas, Lan Zhan, Shouto)! You can't just say things like that!"

Unhealthy Coping Mechanisms™