Undyne is head officer in Frisk's town and an Act 3 character. She is admired by many and gets involved in Frisk's life and musical when she catches Frisk breaking the law while she's trying to get her backpack back. Papyrus is one of her friends, despite the fact she could never let a kid into the force. But she does teach him how to cook so he doesn't waste his life on disappointment. She moves in with Sans, Papyrus, and Gaster, after her house burns down with Frisk over. She should have an Alto/Mezzo Saprano voice.