Eris is the daughter of Killer!Sans and Frisk... In this AU sans went insane due to the genocides happening over and over until he made a deal with Chara and she now inside of him and gives him the ability to use knifes, when he learned that frisk was being controlled by the player he figured out what was happening and made a deal with Gaster to break the connection with the player but it left Frisk with lots of Trama of watching herself kill everyone, this would leave her dislosional at times... Sans now cries black tears since he became a emotionless killer trying to stop the player with Chara's help. Eventually Frisk and Sans would both marry and have a daughter named Eris, she has white hair with some strands red like stained blood, a grey sweater with a blue jacket with blood stains in it and black shorts, she has and red heart locket on as well, she has red eyes that glows... when she cries she has black tears that would stain her face until she would wipe it off like sans... unfortunately most of the monsters including Sans's brother Papyrus is dead because of him leaving Eris to be a bit lonley but terrorizes some of the local monsters who tried to show their power to others... At Snowdin Eris is training with her knife skills as Sans and Frisk watch Sans: Knife one eh? He leans over to Frisk, His eyes glowing faint red Frisk: ... hush dear... let her concentrate... She mumbles Eris: Knife pun dad She twirls her knife around Sans: that... was terrible He mumbles as Frisk rolls her eyes