Foolduke is a young female Mewman with brown skin, blonde hair, and brown eyes. She wears a light blue long sleeve shirt with three light purple diamonds on the front, blue pants and pointy shoes, and a blue jester's hat with golden bells on the ends.
Foolduke first appears in "Marco and the King" after several straight days of partying with King Butterfly at Butterfly Castle. After waking from being unconscious, she asks the king where her pet monkey is, unaware that he tossed it out the window a few moments earlier.
In "King Ludo", after Ludo has taken over the castle, Foolduke, Ruberiot, and Mime Girl go into hiding and use his royal amenities whenever he's not around. When Ludo returns to the royal bedchambers, Foolduke and her fellow performance artists sing a song to pretend to entertain him while Marco Diaz tries to steal the dungeon key from him. Ruberiot and Foolduke begin to argue, and Foolduke manages to steal Ludo's key in the process. When Ludo banishes King Butterfly from the kingdom, Foolduke and her friends form a resistance movement with Marco to overthrow Ludo's reign.
In "Toffee", the Resistance's tactics mostly involve ruining Ludo's credibility. After they are captured by Ludo's monsters, Marco is rescued by Queen Butterfly and Buff Frog, and he leaves his fellow freedom fighters behind, much to their sadness.
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- Foolduke is voiced by Natalie Palamides, who is best known for providing the voice of Buttercup in the 2016 reboot of The Powerpuff Girls.