I saw a post about Yuu and canon facts about them so I went through all the character voice lines and picked out all the other facts I could find. Some will be a repeat of what’s mentioned in the original post, which you’ll find here. I may update it as the game and manga progress.
I hyper fixated HARD on this.
Last Update: 11.13.2023 | recently added info will be bolded
You have no idea how happy you’re all making me <3333
Yuu likes initiating physical contact. They’ve poked at Riddle and Leona’s tsum a lot. They’ve also poked at Leona, Ortho, Kalim (tickling him in the process), Jack’s sides, Deuce (twice), Floyd, and Epel. Yuu tugged on Riddle’s sleeve during a lab class, Leona while camping, Kalim’s ceremonial robes headdress, Trey’s Halloween veil, Sebek’s sleeve (much to his dismay), and Vil. They’ve pulled at Jack’s ceremonial robes and Ace’s arm. Vil teases Yuu in a voice line saying that he can’t fault their overwhelming desire to touch him given his alluring beauty. They touch Malleus and he teases that if they continue to do so, Sebek would throw a fit. Malleus welcomes Yuu to touch his horns. Yuu also touches him without shrinking in fear. They wanted to touch/hold Jamil’s gala couture corsage, he also asks if touching is customary where Yuu is from. Yuu has almost touched Ortho’s heat exhaust and even managed to tickle him. Yuu kept clinging to Lilia during lab class in hopes he’d tutor them. Floyd called Yuu a barnacle which may suggest they kept clinging to him. They kept touching Jack’s Halloween costume which made him worry the shells would fall off. They pet Cater’s tsum WHILE looking at him, which gave Cater mixed signals. Deuce complained once how they were getting handsy with him. They’ve tickled Floyd—who promised to get them back. They played with Floyd’s tsum. They straightened Epel’s ribbon (Ghost Bride) without warning him and Silver’s horned hat during Halloween. They scratched under Grim’s chin without asking.
Yuu attends every character’ birthday celebration and always seems to have a good time.
Yuu has a knack for dancing.
Yuu has the habit of staring at other people, just about every character calls them out on it.
Yuu had difficulty with basic lab textbook questions, which may be expected since they’re not from Twisted Wonderland.
Yuu wears makeup, at least to ceremonies.
Yuu thinks the amount of traditional events NRC has is unusual.
Yuu asks for help with studying and homework from their friends—at least the better educated ones.
Yuu appears to be someone who gets anxious at ceremonies. Trey had to tell them to stand still and stay quiet, implying they get fidgety and restless. Ruggie teased Yuu about how they squirmed in preparation for a ceremony. He was also rushed by Yuu who feared they wouldn’t make it to the ceremony in time. Jamil had to guide Yuu in taking deep breaths when they were anxious, he also points out they were fidgety.
Many characters have commented on Yuu’s diligence.
Based on dialogue, Yuu is quick to pass snarky/sarcastic responses.
Yuu seemed to adapt to Twisted Wonderland fairly quickly. When they saw Jack for the first time, they can make a comment about how he has dog ears and a tail in a seemingly (distant?) tone. They never pointed out or questioned Malleus’ horns. Reminder they freaked out when they first saw Grim, before any other character, so they’ve grown accustomed to the strangeness of NRC.
Yuu was once able to play with Leona’s tail. Yuu grabbed Ruggie’s tail during his birthday. They grabbed Jack’s tail, too. They tried to grab Malleus’ tail during Halloween but he wouldn't let them in fear it would send Yuu flying.
There’s a good chance Yuu tends to fall asleep in class. Jack promises to wake them up if they do, commenting that he can’t focus when someone is dozing off next to him. Trey reminds them that he won’t wake them up if they fall asleep. Ace caught Yuu dozing off once.
Yuu isn’t very good at keeping their attire in place. It’s pointed out by a handful of characters, and even in the main story. The hood of their robe was once inside out during a ceremony. The collar of their PE uniform was all wonky. Vil has even said the uniform is a bit too big and makes them look sloppy— and that their labwear was wrinkled. Trey says it looks like the school uniform is wearing them.
Yuu doesn’t really know how to behave/carry themselves in formal situations.
Yuu had an awful bed-head while camping.
Yuu seemed excited about the Beanfest event. Jack says that they’re “pretty gung-ho” about it. Apparently there’s a tale similar to Beanfest where Yuu hails from. Yuu wanted to team with Azul during the event. Jamil said they were very into it. Vil complimented Yuu’s skills during Beanfest but was quick to shut down their excitement. He also comments that Yuu is surprisingly good at the event. Yuu was confronted by Rook and feigned surrender. Based on other voice lines, it seems Rook hunted Yuu at some point.
It can be interpreted that the freshmen get together at Ramshackle.
Yuu is serious about helping Grim become a great sorcerer.
Yuu is easy to scare, many characters got the drop on them during Halloween. You didn’t seem to get them back with much success.
A few characters comment how/if Yuu has grown used to living in Twisted Wonderland.
Not necessarily a Yuu fact, but Ramshackle gets lots of snow during the winter.
Yuu can come off as a boisterous person at times.
Yuu is not fazed by Riddle’s temper/behavior.
Ace regularly invites Yuu to his basketball games.
Cater gave Yuu a ticket to the Pop Music Club’s show.
Yuu is apparently homesick, something they confide in Cater with at least twice.
During their visit to the Scalding Sands, Yuu got worn out by the crowds. Cater took them aside to sit and rest.
Cater doesn’t know what’s going through Yuu’s head.
Based on a few voice lines, Yuu is very familiar with Cater. To a point where he reminds them that he is an upperclassman that deserves respect.
Ace, Deuce, and Cater are both disappointed to an extent that Yuu isn’t in Heartslabyul.
In some of his ceremonial robe lines, Leona suggests he and Yuu ditch.
Yuu gave Leona candy during Halloween hoping it might make him happier.
Yuu is relaxed around Leona.
Yuu tried to sneak up on Leona to surprise him on his birthday, but he noticed them before they could jump out.
Yuu liked Leona’s gala couture.
Because Grim ate their food during the camp event, they went to Ruggie for spare food.
Ruggie comments on how the other campers can’t pitch a tent or start a fire, this may or may not have included Yuu.
Azul has said Yuu has a tender disposition.
According to Azul, Yuu seems to have a good time during flight class.
Azul doesn’t believe them to have a good singing voice.
Jade has teased Yuu, calling them a mischief-maker.
Yuu wished to climb Mount Molm during the Harveston event, but Jade told them to start with a smaller climb—saying snowy mountains were dangerous.
Yuu isn’t good at plating food. Floyd finds this very funny.
Yuu told Kalim during culinary crucible that they liked his food. But since Kalim’s meals tend to come out a little… crisp and messy, they may just be saying it so as to not hurt his feelings.
Jamil thinks(?) Yuu has an acute sense of smell as they were able to find him preparing a light snack for Kalim.
Yuu thought Jamil was being insincere when he thanked them for celebrating his birthday.
Yuu got a bunch of sauce on their face in the Scalding Sands, something Jamil subtly teased them for.
Yuu sees Jamil as a voice of reason in almost every situation.
Yuu complimented Jamil on his fairy couture which made him feel a little better.
A voice line from Jamil mentions Yuu wears a uniform to school and that it’s “nice in its own right”. This could mean that Yuu’s school uniform is old/a hand-me-down and isn’t necessarily like everyone else’s.
Yuu thinks Rook is a bit odd.
Yuu confided in Rook saying they get embarrassed when they’re sweaty.
Yuu wanted to ride on a horse with Epel during the Ghost Bride event.
Yuu got giddy when it began to snow, a detail Idia pointed out during the Harveston event.
According to Idia, Yuu is a friend to introverts and someone he can count on.
Yuu wanted to wear Idia’s suitor suit attire.
Malleus says Yuu always seems to attract a crowd, but that’s a given since they’re the main character.
When Malleus says a plate in the Scalding Sands possesses a recently made design, Yuu tells him that it’s an antique. Either Yuu has studied Scalding Sands history before visiting or the antiques of Twisted Wonderland are similar to those in Yuu’s world.
Malleus once said, maybe sometime in Book Three, that Yuu was not as innocent as their doe-eyes would suggest.
Yuu once wanted to see Malleus dressed in his ceremonial robes, so he wore it just for them.
A line suggests that Yuu lingered around and focused on Malleus during his birthday party.
As thanks for participating in his birthday party, Malleus invited Yuu to visit about ten ruins.
Yuu wanted to hear an earnest proposal from Lilia during the Ghost Bride event.
There’s a very real possibility Lilia gave Yuu a piggyback ride during Halloween.
When Sebek chastised Grim’s gluttonous behavior, Yuu seemingly gave him a dirty look.
Yuu had difficulty handling Harveston sleds, leading Sebek to brag about how he could do so with ease.
Silver has said Yuu worries too much about those around them.
Silver thinks Yuu has some talent with a sword.
Judging by a voice line from Professor Crewel, Yuu isn't that good academically and may be close to failing his class. He also says they and Grim are his biggest troublemakers.
On the contrary, Professor Trein says during the Glorious Masquerade that he doesn’t worry about Yuu and Grim. (I theorize the following: Crewel’s classes are based in magic, a feat Yuu doesn’t have. Therefore they’re likely to sit on the side as Grim does the lessons assigned. But knowing Grim, he causes trouble in class. Since Yuu and Grim count as one student, Crewel assumes that they’re both rowdy. Meanwhile, Yuu is able to participate in Trein’s classes, which are more traditional with studying and tests. Yuu is in tune with this method and can therefore excel, while Grim can’t as he wasn’t raised alongside humans. Crewel gets the wild half and Trein gets the responsible half.)
Yuu has the option to buy woven bands during the Glorious Masquerade event.
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