I know most people in this fandom ship Yuu with Malleus, but Ace and Yuu is a great ship as well. Especially considering Ace has tried to sleep on the same bed as Yuu multiple times.

Like- My friends to lovers senses are tingling!

Evidence:

The first photo is from Book 1. The second photo is from Book 3.

Okay so I'm sorry for word vomiting here but I've got this AU that I've been developing in my head for the past few weeks. I call it my Disney Crossover/House of Mouse/When I say everyone loves Yuu, I’m talking about the entire Disney animated multiverse AU.

(I’m going to be referring to Yuu as she/her because of my own pronouns)

Basically, Yuu ends up working at the House of Mouse every night for extra money because Crowley sucks. She travels through a magic mirror in Ramshackle. Everyone there loves her: the (human and animal) adults think of her as their daughter, the animals love her (she’s not a beast tamer for nothing), the kids constantly want to hang out with her and even the villains have a soft spot for her (mainly because she treats them like normal people and not as villains. She’s super kind and sweet to them even when they try to scare her). Somehow, they realise that they don’t really know who she is or how she got there or anything so they ask her about it and she’s like “it’s a long story I don’t want to explain the whole thing.”

So due to either Disney Magic™ or one of Professor Von Drake’s inventions, the entire Disney theatrical animated universe watch everything that’s happened to Yuu so far in Twisted Wonderland. So obviously this would lead to lots of questions and everything but that’s not what I want to talk about. Oh no. What I’m getting to is this:

Ship Wars.

Everyone sees how Yuu has got each and every boy at NRC wrapped around her little finger and she’s literally so dense and oblivious to how positively smitten and whipped they are for her so they play a little matchmaking. Obviously The Great Seven™ would want Yuu to get with their own Twisted versions. It was unprecedented. Normally every villain knows not to get on the bad side of the Mistress of all Evil but the second she’s like “she’s my future granddaughter, my Malleus has been courting him the day they met” WWIII breaks out.

The Heroes™ are at first like “why villains though?” before realising that the boys would rather chop off a limb before they would ever think about letting Yuu get anywhere near harm and they’re like “so for their wedding, I’m thinking…” Because what’s the biggest bragging right than having the beloved Yuu getting with someone that’s based on your story.

Listen, because I have ideas™ of villains trying to get their kid (yes, they see the boys as their kids, sue them) with Yuu and the heroes being like “Are you married? No. Move over.” Simba and Nala helping Leona with ‘Can You Feel the Love Tonight 2.0’ whilst Scar and the hyenas scheme in the shadows (the hyenas love Ruggie by the way. He’s an honorary member of the cackle), Aladdin and Jasmine hardcore shipping Kalim with Yuu (Aladdin to the other princes “they rode on a magic carpet and had an elephant parade. Perfect first date material right there.”) whilst JamilYuu shippers Jafar and Iago seethe, Alice may not know much about relationships but she’s got an imagination, an older sister and sees how invested the White Rabbit, card soldiers and the Queen and King of Hearts are with RiddleYuu so she’s going to help. The Dwarves hate Vil. Snow White loves everyone. She just wants Yuu to be happy. Lovable himbo tries to get Idia and Yuu together but Meg just rolls her eyes and Hades yells at him for ruining his plans. Ariel and Eric see Azul, a mer who’s fallen in love with a human and they’re like “our time has come. Sebastian, get your voice ready.” and Ursula’s like “that might be the one good idea you two have ever had”. Maleficent has been MalleYuu Shipper No1 from the start (a title that Lilia had to give up to her after a one minute stare down). She already has a room prepared for the prefect for when she visits the Valley of Thorns. Aurora, Phillip and the three good fairies think that Malleus is a sweet boy and are rooting for him.

Of course, there will be ship wars.

And don’t get me started on the battles that the villainous henchmen/sidekicks get with each other. If I have motivation, I might write something for this AU but I have a bunch of headcanons and scenarios for it. Also, Yuu is an honorary Disney Princess. She gets to sit with them at their table and has a personal invite to visit their castles whenever she wants so that they can have some girl time together. (Mulan and Merida mainly want to teach her how to use weapons and are 100000% ready to hunt down any of the boys that try to mess with her).

Listen, I love everything about this. House of Mouse was one one my favorite cartoons as a kid so i'm all on board for this. (It is an affront that the series is not on Disney+, but at least its on Youtube.)

Mickey tapping on the glass of the Ramshackle mirror: Hey, hey kid. Wanna work at my club?

All i'm thinking of is the episode where Max has a date with Roxanne and everyone swears not to embarrass him, and then proceeds to embarrass with their well intentioned attempts to make it perfect. Like dedicated Sebastian's Kiss the girl performance and setting up a Lady and Tramp style meal for them. That, but with the NRC boy of the week.

Miss Yuu: I'm going to be bringing my friend Azul this Friday. When he heard about the club he was interested to check it out for ideas for his lounge.

The entire cast of the little mermaid:

There is not a speck of chill in that establishment. Sebastian's going to perform Kiss the Girl. Ariel and Eric get the bright idea to invite them to sit with them like a double date. Ursula and batting the other villains from interfering with a stick. It's a mess.

Rinse and repeat every other week with a different student.

Imagine Hades trying to teach Idia how to be a quick smooth talker to get Yuu to go out with him and its just failing miserably. Or Yuu just glaring at the Magic Mirror in the lobby.

Or ladies night at the House of Mouse, and all the princesses insist Yuu sit them and enjoy the show, and Minnie assures her she can take a break for a while. Then upon Clarabells suggestion in the episode, they do a bachelor auction, Only the Bachalors are Vil, Malleus, Leona and whoever else they could rope into it. Only all the princesses are bidding on their favorites and then giving the date to Yuu.

And like you said, everyone sort of adopts Yuu in their own way. But Goofy especially is going full dad mode for Yuu. Just comes to her defense at any moment like he does with Max and its very sweet.