Chara

Chara, the first human to fall into the Underground in Undertale, is depicted as a child with light brown hair, rosy cheeks, and red eyes. They are often portrayed wearing a green and yellow striped sweater, black pants, and brown boots. While their gender is ambiguous, they are typically drawn with a somewhat androgynous appearance. While Chara appears to be a relatively normal child who died in the underground, their personality becomes more sinister and player-driven in the Genocide Route. In the Neutral and True Pacifist Routes, Chara's influence is more ambiguous, with some interpretations suggesting they guide Frisk and others suggesting they are a malevolent entity. *don't use the voice or flowey will strangle you in your sleep*