Fuubii, also called Booby or Perman No. 2, is a chimpanzee chosen by Birdman to become a superhero, embodying the principle of non-discrimination between humans and animals. He initially resided in a zoo, forcing him to sneak away at night for superhero duties; this background was later altered, depicting him as a pet chimpanzee living with an elderly couple to better support his crime-fighting activities.

Operating as Perman No. 2, he adheres to the same secrecy rules as the other Permans, employing a copy robot to preserve his civilian identity during missions. Unable to speak human language, he communicates through gestures and manipulating objects, though his fellow Permans comprehend him. Despite this communication barrier, he displays high intelligence and frequently aids teammates in situations involving humans. In stories centered on him, he partners with animals, using his ability to converse with them.

His team role involves contributing to operations that prevent crime and disasters, often utilizing his distinct perspective as a non-human hero. The character maintains consistent traits across all media appearances, including films, without significant evolution or additional background details beyond his established superhero functions and interspecies communication skills.