Underworld side. A Godfather-like figure. Self-proclaimed god. A bit of a silent idiot. Since he's a skeleton, he has no hair or muscles. Doesn't know how to eat fish. Male.

Underworld side. A troublemaker who wrecks Error404's plans (not that they were that grand anyway). A loud-mouthed idiot. Since he's a skeleton, he has no hair or muscles. Wants to dance Twinkle Twinkle Little Star. Male.

Underworld side. Worried because he's been so quiet lately that people sometimes forget he exists. Supposed to be the stopper for Virus404 and Error404, but he's barely functional. Constantly thinking of ways to stop them. Male. Since he's a skeleton, he has no hair or muscles.

Civilian side. Positive and energetic! Can't peel tangerine skins. Nightmare's twin brother, and a total brother-complex who loves Nightmare to death. Possesses a (questionable?) positivity that never flags no matter how much Nightmare rejects him. Male. Since he's a skeleton, he has no hair or muscles. Light AU.

Civilian side. Energetic and just plain cute!! Great reflexes, but trips over jump ropes. Loves everyone equally! Has never talked to the underworld side but is trying to befriend them. Just super cute. Since he's a skeleton, he has no hair or muscles. Male. Light AU.

Civilian side. Very energetic but emotionally unstable at times. Forgetful, often taking notes on the long muffler wrapped around his neck. Carries a giant paintbrush. Becomes incredibly quiet when low on ink. Since he's a skeleton, he has no hair or muscles. Male. Light AU.

Civilian side. In a way, the strongest. The gag maker. Effortlessly dodges threats from the underworld side. A brother-complex who loves his brother (Papyrus). Loves ketchup enough to drink it straight. Since he's a skeleton, he has no hair or muscles. Male. The original. Sometimes called Original Sans.

Civilian (?) side. Has a total dirty mind. Always full of lust. A troublemaker who mixes up the underworld and civilian sides. Often messes up and gets hurt for it. Since he's a skeleton, he has no hair or muscles. Male. Wants to satisfy his desires more than eat tangerines.

Civilian side. A bit of a hard worker. Always looks irritated, but he's just tired. Tsundere. The straight man and cleanup crew, basically the mom of the group. Actually kind. Since he's a skeleton, he has no hair or muscles. Male. The type to mysteriously save tangerine peels.

Nightmare: Civilian side. Boss of the Dark AUs. The Emperor of Darkness (lol). Hates positivity with a passion. Dream, don't come near me. Since he's a skeleton, he has no hair or muscles. Male. Dark AU. Can peel tangerines.

Killer: Civilian side. Troublemaker. Moody. Frivolous and aloof, but dangerous somewhere deep down. Since he's a skeleton, he has no hair or muscles. Male. Dark AU. Often fights with Murder. Calls Murder the 'hallucination guy.' Black tears always flow from his eyes.

Murder: Civilian side. Extreme brother-complex who loves his brother (hallucination of Papyrus). Hard to tell what he's thinking, but he's probably thinking of nothing. Since he's a skeleton, he has no hair or muscles. Male. Dark AU. Often fights with Killer. Calls Killer the 'ink-stain guy.'

Horror: Civilian side. A glutton. Rough and moves at his own pace. Surprisingly honest. A bit violent. Since he's a skeleton, he has no hair or muscles. Male. Dark AU. Actually quite cute. Like a large dog. Eats tangerines whole, peel and all.

Error: Civilian side. Self-proclaimed god. Nervous. Difficult. Bad at socializing. Since he's a skeleton, he has no hair or muscles. Male. Dark AU. Haphephobic. Rates his own cuteness as an 11 out of 10.

Cross: Civilian side. A hard worker. Serious with a strong sense of responsibility. A bit clumsy. Often gets dragged into things. Since he's a skeleton, he has no hair or muscles. Male. Dark AU. His IQ drops to that of a cactus when talking about tacos or chocolate. Screams in rage because he hates cows and milk so much. Can peel tangerines but can't peel oranges.