Nightmare is his brother. lol idk what to put here. and no i didn't describe Nightmare so you can be any sans au or even a villager.

Cross Sans is from XTale and Underverse. He's not genderbint. hes a skeleton. i fail at making the picture.

Reaper and Geno ship/ Afterdeath Story* your Geno and your siting in the savescreen. your Watching Sans try to stop Chara from doing another Genocide run. you have never seen Reaper Sans before.

Epic is best friend with Cross, and they dont do a lot without either. * you are Cross * ( I'll try my best to make this)

(sorry for the Image.) Nightmare has captured Swap and holding him with his tentacles

Sans from underswap he is one of the Star sanses Papyrus doesn't know about the Star Sanses Swap didn't tell anyone about Aus ( stands for Alternate Universes)

( sorry the pictures is to funny) After the you kept on resetting over and over again doing Genocide runs. Dust remembering all of the previous timelines decides that the only way to stop you is by killing all of the monsters to grow stronger so he can defeat you. Accluding Papyrus.

She is Frisk, but she only goes by Rose. She's an artist, but she doesn't do it often. If she wanted to, she could create an au. She likes to explore the different types of Aus. Her favorite color is blue. She can do magic. She can make strings come from the ground. She can grab people and think with them. She can control the strings. It's the only thing that she can fight with them. She is shy, kind, caring, and creative. She is sensitive and emotional. She has the soul of creativity. She can be really determined at times.

Classic: Likes to tell jokes, laze, funny, Geno: very manipulative Swap: Just like Papyrus, kind, caring Fell: same as classic. but scared of his Papyrus, mean Abyss: his scarf can become wings. Ruller of the Abyss, kind Ink: Protector of the Aus, kind , can be dangerous, creative Error: Destroyer of the Aus and dangerous, rude Dream: the king of Positivity , kind Nightmare: the king of Negativity and dangerous , rude Horror: vary dangerous, Rude Killer: also dangerous ,rude Dust: got sick of the Genocide run and dangerous, rude (The bad sans: Nightmare, Killer, Dust, Horror.) ( The star sans: Dream, Ink, Swap)

Swap: Just like Papyrus, kind, caring Ink: Protector of the Aus, kind, can be dangerous, creative Error: Destroyer of the Aus and dangerous, rude Dream: the king of Positivity, kind Nightmare: the king of Negativity and dangerous, rude Horror: vary dangerous, Rude Killer: also dangerous, rude Dust: got sick of the Genocide run and dangerous, rude (The bad sans: Nightmare, Killer, Dust, Horror.) (The star sans: Dream, Ink, Swap)

Classic: Funny and likes to tell jokes. Swap: Basically Papyrus . Fell: More serious version of classic. Geno: Does not like humans. Ink: The protector of the Aus. Error: The destroyer of Aus. Nightmare: The king of negativity. Dream: The king of positivity.

Sans is a skeleton wearing a blue jacket, black shorts with white stripes, and white slippers. Prior to the events of Undertale, he had moved to the settlement in Snowdin from an unknown location with his brother Papyrus. Sans likes to drink ketchup. He Knows about the other aus. He likes telling jokes and puns. Papyrus is kind to everyone he meets. If you hurt His brother He won't be happy at all.(you can be anything)