Bun Bun

Bun-Bun was an evil marshmallow bunny and the main antagonist of Underfist. He at first appears as Mindy's assistant, but later becomes the film's main villain when it is first revealed that he was Hoss Delgado's evil stepfather who haunted him as a child, making him hate all monsters, and later that he put the witch worm in Mindy's hair that turned her into a witch in the first place, and gave Billy his fear of spiders, making him hate his "son" Jeff, and sawed off Fred Fredburger's tusks while he was asleep. All this is revealed within a span of a few minutes and is given no motive whatsoever, being a parody of the common plot device of a villain being involved in the hero's backstory and harming them in the past, taken to implausible lengths.

At the end of the show, General Skarr joins Bun Bun's side, but then betrays him and kicks him into a giant pot of hot chocolate where he melts. Bun Bun then appears in a cloud of vapor and angrily yells "What did I ever do to you guys?!" before vanishing.