The batfam (+peter) in Twisted Wonderland has been stewing in the back of my mind and i just find it silly to think about them interacting with Malleus since its implied part of the reason he likes yuu so much it's cuz they don't act scared of him and treat him like any other person (and have invited him to events) and i think the batfam may be able to fall on his good side thanks to that, what do you think?
oh 100000% malleus would be their friend. the batfam sees the wildest shit every day of their lives and malleus wouldn't even make top ten. "oh you're a magical dragon wizard prince from an alternate dimension? why would anyone be scared of you?" (said so seriously). and with peter he has an innate ability to make friends with people so quickly once they pass a vibe check. their first conversation would be peter being like "ok but can you turn into a dragon cause that would be sick as fuck. what? no im not scared. you should turn into a dragon. ugh why would i be scared of you? i stick to walls, my guy. huh? did no one tell you i can do that? holy shit this is about to be so fun i'll show you my tricks and then you turn into a dragon."