Berryl

Berryl is a friendly ghost that inhabits the underground. While just being a hand and a head, they love (and somehow manage) wearing clothing, like giant turtleneck sweaters. They keep their hair in a long flowing mohawk. And sometimes, when the hand moves, the empty sweater sleeves follow it (and sometimes the sleeves do nothing. Silly sleeves).

They are overly helpful to the fallen human, and like the human no matter what. Their only attack is healing the human's soul.

They will secretly follow the human throughout the whole story, and will even pretend to be a save point to heal the child.

---

In genocide, Berryl will pretend to die, but then continues to follow the fallen human through the underground, healing them and sticking Chocolate in their inventory.