Basically my Fire Emblem Heroes au mixed with Undertale.

Frisk: Veronica
Chara: Bruno
Flowey: Leo in the main au, but in the swapping aus, minus Emblemswap it always changes to fit the Asriel of the AU.
Toriel: Sharena
Asgore: Alfonse
Sans: Marth
Papyrus: Ike
Undyne: Titania
Alphys: Reinhardt
Mettaton: Ariel (the summoner)
Napstablook: Anthony
Temmie: Anna
Royal Guard: Greil's Mercenaries
Monster Kid: Mist
Muffet: Lucius (is always your ally no matter what au)
Asriel: Xander

Thoughts?