Okay, so these are sort of vague ideas so far, but...
Bucky will most likely have the Best Time Ever aka I'll combine the reverse-deage event with this one, making him the Winter Soldier for the length of the event! He'll start out not remembering anyone or anything at all, and slowly regain some of his Kiseki memories (very vaguely...) during the event. Apologies to all his CR... but hey, at least he'll be amazing at killing the youkai. Like, frighteningly amazing.
Stiles is my only priest (so far...) and he's stupidly self-sacrificing when the occasion calls for it, so I'd love to play that out, especially in regards to his close CR. I'd also want to have him try to, idk, try to figure out what the monsters are doing/classify different youkai types/etc so if anyone is analytically inclined, pls join him.
Sorey I have very little plans for, aside from FIGHTING EVERYTHING!!1 protecting everyone he will be very upset that he can't help the trees or more about the solution to helping them... but this is a good chance to a) have him show off his fighting skills that he's learned all by himself, and b) build more CR hopefully as he would literally jump in to defend everyone.
... for "I have no concrete plans" this got very tl;dr o o p s.