Alrighty so here we got Alphys, Asriel, Chara, Frisk, and Undyne
Note for Targetraptor and Goblinshark. Targetraptor was alive for a year after Asgore was chased out. But she warned Undyne about being a normal monster and being so close to human souls. It was already shifting both their bodies and minds. Alphys was aware of that, and tried her hardest to get Undyne to contain the souls. But Undyne was already pretty hard shifted. She attacked Alphys, taking her arm. Alphys ended killing herself because her crush did this to her, and she realized there was no saving the underground.
Note for Undyne. The longer her ear fins, the more dangerous she is.
Also note. Alphys’ feather frills are longer if she takes good care of herself. So basically Powerraptor and Wetraptor. The rest don’t take the best care of themselves, so their feathers are short and kinda stick out everywhere.
Note for Foxsquad, Dancesquad, and Lostsquad. In Underswap it’s normally Frisk and Chara that swap. But for Beastswap it’s Chara and Asriel that swap. So Asriel is trying to make sure Frisk is a good kid and frees the Underground. Chara is based off of a Foxglove flower. Dancesquad Flowey is based off a rose. Lostsqaud Flowey is based off being dead B)