Combotato

Combotato is a character in The Epic Tales of Captain Underpants. She has the heads of Dressy Killman, Sophie One, Harold Hutchins, Gooch, George Beard, Bo Hweemuth, Erica Wang, Stanely Peet, Other Sophie, and Jessica Gordon, and, for some reason, they all speak at the same time, similar to Chuck and Silver from The Angry Birds Movie 2. When she discovers she's a potato, she becomes angry and starts referring to herself as "a hideous hybrid" and "a mash-up monstrosity", and then she tells all the kids she will avenge all potato kind, until Captain Underpants attempts to defeat her (but sadly fails). Luckily, Erica discovers that she's just a figment of CU's imagination, so with the help of the kids' teamwork, Combotato blew herself up with Melvin's DNA collector (unfortunately, I couldn't remember its name. Sorry!), and exploded into a bunch of mashed potatoes everywhere.