This is going to be really interesting, for one there's quite a lot of "Smart" people in these characters who'll be in discord with varied ideas, there are also the wisest and of course the most cheery ones. I'm really excited if someone would make a fan fiction of this, I could just already hear Alhaitham figuring out the whole thing through "The process of elimination" with Albedo and Yae both being bluntly smart and suggesting creative ideas to lead everyone in one direction on debates both Zhongli and Nahida being the wisest to calm everyone out, Hu tao examining the bodies as the funeral director with Kazuha and Cyno finding a lot of hints. Tighnari, Ayaka, Kokomi and even Eula surprisingly sorting out everyone's diets and lifestyles. Kazuha, Nilou, Collei, Cyno and Dehya being the relief throughout the whole thing. I can't say much for the Harbingers, Travelers and Paimon but I can say Paimon, Cyno and Raiden being the comedic reliefs with the the shogun sometimes suddenly surprising everyone with a much more blunt attitude with everyone. UGH tysm for making this vid, now I lay here on the floor rotting with ideas and headcanons.
I would really want Xiao and Tighnari to live in this hypothetical story since they're among my favorite characters (and I kinda have a crush on Xiao), but knowing my luck and their personalities, I honestly have my doubts about it happening...