The coordinator of the Dark AUs. Surprisingly caring toward his comrades, he's a bit of a tsundere who shows kindness in the shadows. Aware that humans are repeatedly resetting and committing genocide, he began his own massacre to gain power, eventually killing his brother Papyrus, whose ghost he now hallucinates. He wields Asgore's trident, Undyne's spears, and Toriel's flames. He uses Gaster Blasters and bones, while Phantom Papyrus assists by firing red bones or turning the Light AUs' vision red to disorient them. Part of the Dark AU side. [AI: Deploy 1st.]

Nightmare's favorite. A cheerful psychopath who often idly plays with a knife. He is kind and loyal to his fellow Dark AUs, acting as the group's jokester. He can manipulate Save and Load, and at full power, even Reset, though it requires massive energy. He was enticed into the Genocide route by Chara and slaughtered all monsters. He attacks with knives and a mysterious black liquid, and can use bones and Gaster Blasters; his blasters fire black liquid or explode. Part of the Dark AU side. [AI: Deploy 2nd.]

The problem child of the Dark AUs. Cheerful, energetic, and incredibly gluttonous with a love for meat. In life-or-death battles, he becomes slightly more serious and protective of his allies. After Undyne gouged out his glowing eye, he replaced it with a Royal Guard's eye, which is now stained blood-red. He serves as the Dark AU mascot. He carries a large axe and can only manipulate sharpened bones. Part of the Dark AU side. [AI: Deploy 3rd.]

Another problem child of the Dark AUs. A psychopathic, rowdy battle maniac, yet he possesses a surprisingly caring side for his teammates. He acts as the brawler of the Dark AUs. He carries the head of Papyrus, which has a sharp bone stuck in it. After being exposed to mysterious radiation by Gaster, he became a psychopathic combatant and slaughtered every monster in the Underground. He goes berserk when serious. He can use Save, Gaster Blasters, and bones. Part of the Dark AU side. [AI: Deploy 4th.]

The serious skeleton of the Dark AUs. He has a serious yet occasionally bright personality and is good at comforting others. He acts as the caretaker of the Dark AUs. He wields a massive sword called a Hack Knife and controls Gaster Blasters and bones. After X-Gaster rewrote the world countless times, his own world completely collapsed, leaving Cross alone in a void of nothingness. To restore his world, he steals data from other AUs and often fights alongside X-Chara. Part of the Dark AU side. [AI: Deploy 5th.]

Cruel, cunning, and willing to use any means to escape X-Gaster's control and reclaim their world. A cynical provocateur harboring deep hatred and trauma toward X-Gaster. There is a stark contrast with their childhood self, who was a normal, honest child wishing to live happily with Frisk and Asriel. Abilities include OVERWRITE, a giant knife, and magic blades. OVERWRITE can pull the furthest Light AU close and set their HP to 1. Stabbing the knife into the ground fires X-shaped lasers. The giant knife and magic blades summon countless glowing red and purple swords for powerful long-range and area-of-effect attacks. Part of the Dark AU side. [AI: Deploy 6th.]

A mid-boss of the Dark AUs. Cheerful and energetic but with psychopathic tendencies; cares deeply for his comrades. He acts as the vice-commander of the Dark AUs. Composed of black liquid with a yellow aura, he manipulates a dark bow and tentacles. Similar to Nightmare, he is immune to everything except positive emotions. Formerly known as Dream, he turned into this form after eating a negative apple with Nightmare. He deeply treasures Nightmare. Part of the Dark AU side. [AI: Deploy 7th.]

The King of the Dark AUs. He will save even a dying ally, though he uses the tsundere excuse that he's just 'reusing a pawn.' Call him a 'squid' and he'll crush you. He acts as the commander of the Dark AUs. Made of black liquid, he attacks with tentacles and is immune to non-positive attacks. After being bullied in his own world, he tried to eat a negative apple, but Dream ate one too, causing them both to transform. Part of the Dark AU side. [AI: Deploy 8th.]

The strongest tier of the Dark AUs. Relatively quiet but often plays the straight man to the other Dark AUs' antics; a tsundere who cares for his allies. He acts as the group's voice of reason. In terms of raw power, he rivals Nightmare. Originally Geno Sans, he used dangerous Determination magic until he accidentally warped himself into the Anti-Void, a white void of nothingness. The isolation drove him insane, and his physical data became glitched and 'errored.' Part of the Dark AU side. [AI: Deploy 9th.]

Ink: A being who uses a giant brush to create and protect other AUs. Lacking a soul, he carries vials of emotional ink to temporarily feel emotions. He is dedicated to the survival of worlds but can be cold regarding the lives of individuals. Forgetful and childish, but cares for his friends. Dream: Possesses a mix of innocence and loneliness. Guardian of the positive apples on the Tree of Feelings. He uses a transforming weapon; his staff fires positivity or creates temporary shields for allies. It can also become a bow or daggers. Anti-Virus: Cold and possessed of a strong sense of justice. He can temporarily erase viruses, create powerful barriers, and fire beams that clean up or destroy enemy data. Swap: Energetic, pure, and serious. Uses bone attacks, Blue attacks (damage if moving), and Gaster Blasters. Outer: A lazy, pun-loving, easygoing skeleton. Uses bone attacks, Gaster Blasters, Blue attacks, teleportation, and gravity manipulation. Can summon stars or meteors when serious. Fell: A tsundere intimidator who is fundamentally lazy. Uses bone attacks, teleportation, gravity manipulation, and Gaster Blasters. His bones and blasters are sharp and glow red. Sans: Lazy, but serious when it counts. Uses Gaster Blasters, bones, gravity manipulation, and teleportation. Chara: Hates humanity; cold and rational but with a tsundere side. Attacks with Determination and a Save Knife. Distinct from X-Chara. Frisk: Quiet and neutral. Uses Determination and Save/Load. Rarely attacks.