Ritsu is on the bridge! Group B, but idm throwing him at anyone who isn't exploring down below. On the IC utility side of things, he's only about as good at codebreaking as a book-smart middle-schooler can be, but his image projection power could have him serve as a walking powerpoint, a way to visualise certain kinds of puzzles, a light source during the power cuts... He's going to throw himself into the work very wholeheartedly, so I'm down for whatever CR might come out of that.

On the horror side of things, I would be interested in playing with the psychological effects! His canon shtick is kind of that he's real good at suppressing increasing feelings of resentment and paranoia up until the moment he suddenly isn't and hauls off to kill God or something. While his Astoria power doesn't make him much more of a physical threat than an average angry teenager, there could be any number of situations he could make worse in such a mental state, even (especially) if he's attempting to help. Let me know if any of that sounds convenient and/or fun to you!