Undyne

Undyne is a cyborg fish monster you encounter at the Lab. She takes the role of Mettaton.

Appearance
Undyne is a fish-like humanoid monster, but has parts of her body made out of metal, thus making her a cyborg. She has red and blue fins on the side of her head. She wears a black tank top with a boob window in the shape of an upside-down arrow on it. She also wears long red boots and pants that go down past them.