Booby, designated Perman No. 2, is a male chimpanzee recruited as a superhero by the extraterrestrial Birdman, who selected him based on a principle of non-discrimination granting equal status to animals among the Permans. Across multiple franchise installments, including the 1967 and 1983 anime series and crossover films like *Ninja Hattori-kun + Perman: Psychic Wars* and *Ninja Hattori-kun + Perman: Ninja Beast Jippō vs. Miracle Egg*, Booby operates as a hero. Initially depicted residing in a zoo and sneaking out nightly for duties, his background was later revised to being a pet chimpanzee living with an elderly couple, facilitating easier access to superhero activities. His secret identity is maintained using an orange copy-robot.

Though a chimpanzee, Booby exhibits high intelligence and human-like behavior. He communicates not through human speech but via gestures, sign language, and distinct vocalizations mutually intelligible to fellow Permans. His role frequently involves mediating human affairs for the team, and specific storylines focus on his interactions and communication with animals. Booby shares a close partnership with Mitsuo Suwa (Perman No. 1), marked by loyalty and occasional playful conflicts, and maintains strong bonds with other team members Sumire Hoshino (Perman No. 3/Perko) and Hōzen Ōyama (Perman No. 4). He displays empathy, intervening in emotional conflicts such as preventing Mitsuo from obstructing a member's departure and facilitating group reconciliations. A minor subplot involves him developing affection for a female chimpanzee in one episode.