Chara

Chara would have purplish cheeks and she would be frowning. Her sweater would have a stripe that is color black and the other color would be white. She is not capable of absorbing your stats in the end of the Genocide Run but she would secretly live off trash. She would still give you three choices: In the True Pacifist Run, and the Neutral Run she would not appear though if you stay with Toriel you will encounter a Chara Jumpscare and again, Edgytale will remember.
 * 1) She will either let you join her and wipe out the monster race.
 * 2) She will let you battle her.
 * 3) She will let you leave her . (Leading to death and Edgytale would remember.)