Mad Mew Mew

Mad Mew Mew is a console-exclusive character in Undertale. In the Nintendo Switch version, she appears as a secret miniboss in Papyrus and Sans's house. She is a transgender allegory.

Mad Mew Mew appears a catgirl, a human-like body with a cat tail. She has pink hair that is styled as voluminous short side pigtails and wears a pink dress that has a frilly tutu and maroon arm length sleeves, maroon pantyhose and a pair of ballet shoes. She also wears a yellow decorative heart necklace. She always wears this outfit everywhere.

Without all the clothing, she is akin to a regular doll, one with no physical features whatsoever besides a shapely hourglass-esque figure and ball joints, just more life-sized. Though as a side effect of the possession, the body has developed both nipples and functional vagina.

In a previous life, she used to possess a training dummy (this form uses gender neutral pronouns). Just like when she was a dummy, Mad Mew Mew is always angry and a bit rambunctious. She has a tendency to make violent threats and repeat herself three times in a row. 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.

When she was tired of its dummy body, she possessed a Mew Mew doll and unsuccessfully attempts to fuse with it. According to her, the doll was found in a "sciencey place". The ghost, now Mad Mew Mew, hides in the Dog Shrine underneath Papyrus's sink to be alone.

She retains some of her ghostly powers, like floating. Her head can come off as she is a dullahan, though she rarely does this.