Bobo Haha is an animal E.V.O., taking the form of an anthropomorphic chimp with the ability to speak from an alternate Universe. He is Rex's sidekick, he is currently operating against the reformed Providence, appear in Ben 10-Generator Rex: Heroes United.
He has pale purple skin and brown fur. He wears an eye patch and fez. His shirt and shorts are a dingy gray/green color with blue cloth at the bottom of his sleeves, shorts and a line down his shirt that extends to the bottom. He also has blue cuff-links. His outfit is like something out of a Renaissance fair. Under his clothes, Bobo wears a diaper like regular chimps. Though it hasn't been seen in the series, Agent Six said that Bobo was wearing one when he explained how he found Rex, Bobo, and Noah in Abysus. Bobo prefers that his diaper be called a "Simian Undergarment," calling it a diaper irritates him.
Appears at the beginning of the episode watching Rex and Agent Six train but then are sent to investigate the anomaly in the skies over New York, then in a ship will appreciate, along with Agent Six as reinforcements for Rex. But they go in pursuit against Alpha. Later starts to make jokes with Ben, hanging from the tube container dodne this was. Later mocks the situation, that Ben and Rex coats changed since that time did not appear until the end of the episode.