UNDERTALE/Whimsun

Overview
Whimsun is a basic enemy from the ruins who often appears alongside Froggit.

Appearance
Whimsun is a cross between a moth and a ghost. Its body is in the shape of a ghost, and it has an antenna, wings, and feet. Whimsun is a ghostly white color, like Froggit. Whimsun is sensitive to light, like all ghosts are.

Neutral Route
Whimsun will appear randomly during encounters, rarely appearing with Froggit (similar to how Woshua and Aaron do the same thing). Whimsun always dies in one hit, no matter the weapon.

Genocide
The reason why the Genocide Route sometimes happens to fast is because sometimes, all you encounter (other than the other Ruins monsters) is Whimsun.

True Pacifist Route
Encounters happen normally with this monster. You can spare it without doing anything however.