The Bath Boy Gang is a group of male humanoids that threatens Princess Bubblegum in the early days of the Candy Kingdom in the episode "The Vault." They want Princess Bubblegum's amulet, but Shoko fails to retrieve it for them. They frequently attack the Candy Kingdom, leading Princess Bubblegum to create the Gumball Guardians for protection. Only four members appear onscreen.
One of the three unknown members of the gang wears hair curlers and a white swimsuit. The pointy-eared one wears briefs and red bath slippers, and both hold exfoliating stones. The tallest one has green skin and wears a white towel and blue hairnet.