She is from the surface world but one day fell down from the surface world to the underground where the monsters live. she's nice and wouldn't attack anyone but would fight back. She doesn't like hurting people. She rarely even makes threats. she does like playfully to mock people though. Especially flowey. She is a straight A student in school. Which does get her bullied sometimes. Although she's good at just ignoring people. She was adopted by toriel and sans. And has 3 dogs and 2 cats
