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Frisk: Frisk is a normal human and an older version of the normal Frisk (Around 17-18) who tries to survive the Underground and get back to the surface. This version of Frisk is Male.
Chara: Chara is a Vampubus, who tries to posses Frisk, and kill everyone. This version of Chara is female. Her mother is a Succubus and her father is a Vampire. In one timeline, she possesses Frisk and kills everyone, and becomes an out-of-code character.
Flowey: Flowey is sort of a cross between a Vampubus and a Flower.
Asriel: Asriel is a Vampubus who is the son of Toriel and Asgore. He used to be Chara's "step-brother" but Chara and Asriel were secretly in love.
Toriel: Toriel is a passive Vampubus, but she controls her lust, and tries to make Frisk to stay with her, becasue she knows what will happen if they leaves the ruins.
Sans: Sans is a Vampubus, but he also controls his lust. Sans is his normal jokey, depressed self.
Papyrus: Papyrus is a passive Vampubus, and is still trying to get into the royal guard.
Undyne: Undyne is a Vampubus, and tries to kill Frisk to break the barrier. She turns into a Passive Vampubus after you spare her.
Alphys: Alphys is a passive Vampubus, she's the same as she is in Underlust.
Asgore: Asgore is a Vampubus, who tries to kill Frisk and break the barrier. He's the same as he is in Underlust. He turns passive after you spare him.