The King of the Bad Guys AU. He acts like a tsundere(?) who helps even dying allies, claiming it's just so he can "keep using his pawns." If you call him an octopus, he'll crush you. The commander of the Bad Guys. Made of black liquid and attacks with tentacles; no attacks work on him except for positive energy.

The coordinator of the Bad Guys AU. Surprisingly caring toward his comrades and a bit of a closet tsundere. He's actually a kind guy deep down. He sees hallucinations because he killed his brother, Papyrus. Acts as the group's organizer. He can manipulate Asgore's trident, Undyne's spears, and Toriel's fire.

Nightmare's favorite. A cheerful psychopath who often fiddles with a knife. He is kind and caring toward the other Bad Guys. The group's prankster/joker. He can manipulate Save and Load, and if he gets serious, he can even control Reset, though it requires massive energy.

The problem child of the Bad Guys AU. Cheerful, energetic, and an incredible glutton. In battles where people might actually die, he gets a bit serious and shows he cares for his allies. The group's mascot. He carries an axe; he can't use Blasters, but he can manipulate bones.

The serious skeleton of the Bad Guys AU. He has a serious yet bright side, cares for his comrades, and is good at comforting others. The group's caretaker. He wields a large sword called a Hack Knife.

Another problem child of the Bad Guys AU. A psychopathic, rowdy battle maniac, but surprisingly has a side that cares for his comrades. The group's wild card. He carries the head of Papyrus, which has a sharp bone sticking out of it.

The strongest member of the Bad Guys AU. Somewhat quiet, but often plays the straight man to the others' antics; a caring tsundere. The group's "tsukkomi" (straight man). In terms of pure strength, he is on par with Nightmare.

The mid-boss of the Bad Guys AU. Cheerful and energetic but with psychopathic tendencies; cares for his comrades. The group's vice-commander. Made of black liquid with a yellow aura around his body. He manipulates dark bows and tentacles. Like Nightmare, only positive energy works on him. Everyone calls him Dream.

*DustDust Sans: Wears a hood, only his mouth is visible. *Dustfell Sans: Wears a hood, has jagged teeth, and his clothes are generally red. *Dustafter Sans: Wears a hood, manipulates stars and meteors in addition to bones; color scheme is generally blue and white. *Geno Sans: Can manipulate Save and Load. *Fell Sans: Has jagged teeth and generally red clothes. *Flowey Sans: Has Flowey in one eye and can use Flowey's abilities. *Swapfell Sans: Has a vertical scar over one eye, generally purple clothes, and a personality similar to Papyrus. *Fellswap Sans: Has three scars over one eye, generally red clothes, and a personality similar to Papyrus. *Negative Sans: Has a crack in his head, generally orange clothes, and a rather bad personality. *VHS Sans: His body is glitched, his mouth is huge, his eyes are red, and he's even more horrific than Horror Sans. *Fatal_Error Sans: Has a bad relationship with Error Sans and can manipulate errors.