Mad Mew Mew

Mad Mew Mew has a human-like body with a cat tail and ears. She wears a frilly tutu that is pretty big, with the upper frill being white while the one under is pink, a pink t-shirt and long black separated from her t-shirt sleeves that resemble stockings. a pair of black stockings and a pair of white ballet shoes, and her hands are gloved. Below her ears are two yellow bells. Her head is able to come off when the player attacks her, which she catches in her hand and puts it back where it was.

She is constantly angry and a bit rambunctious, switching between the two at a moment's notice. She has a tendency to make violent threats and repeat herself three times in a row. Humorously, she also has a new habit of adding "mew~" to the end of certain sentences. It is unclear if this is a conscious decision made to better coincide with her new body or if it is an innocuous side-effect of the possession.

After Frisk fought and won against Mad Dummy, its ghost possesses a Mew Mew doll and unsuccessfully attempts to fuse with it. According to them, the doll was found in a "sciencey place", which heavily implies that the doll belonged to Alphys, a fan of Mew Mew Kissy Cutie. Her main desire is finally fusing with the doll and not just possessing it.

Mad Mew Mew has the ability to split a SOUL into two different halves, forcefully turning the left half into a cyan color, and the right half into a red color, each controlled separately.