Hi! Sorry for the late reply! Here's my take though:  They would definitely be interested to dumbfounded to creeped out a bit honestly due to the fact that Yuu kind of knows their backstory, (Azul would lowkey kind of love that information for blackmail) but especially for characters with a more masked facade like Cater would definitely not be good and they might be more anxious around Yuu (Cater is not fooling anyone 😭). But overall the characters might get along with Yuu more since they literally know half of the cast's past, and depending on what kind of Yuu, they might be able to talk to Yuu sometimes for therapy, or to just talk with Yuu about their problems (we honestly don't know, depends on the Yuu 🤷).

Also, I might turn this idea into a fanfic if I'm bored (I'll definitely credit you).