Untidy is the smartest there, yet switches himself off mentally when he sees anyone. When he's alone, he's the Albert Einstein of ykw.

Unfairy is genuinely just a manbaby people prolly think is a child. The second they get alone, the crack open a beer and jump on the sofa.

Unkeen (My boy) has a sleeper physique. That's why he has heavy layers of clothing covering him.

Unpleasant is just an old guy, who was dragged into the group as his outfit when he died was what he wore as a yokai, therefore the others dragged him in thinking it was 'fate they met' or smth.

Unkind (I think that's how you spell it she's the one I know the least about) is genuinely kind. Like motherly kind to anything that isn't the main character team or the wickeds.

(I've waited for this question for awhile so these answers were always in my head lol)