Character
Pony Head
Pony Head in Star vs. the Forces of Evil (2015), played by Jenny Slate.
She previously attended St. Olga's Reform School for Wayward Princesses because of her rambunctious behavior. After headmistress Miss Heinous and her faculty were overthrown and driven out of the school in the episode "St. Olga's Reform School for Wayward Princesses", Pony Head helped turn the reform school into a party location.
Read more about Pony Head on Star vs. the Forces of Evil Wiki at Fandom