Oolong was a short pig-like humanoid and long-time companion of Goku. Oolong learned the arts of shapeshifting as the same school as Puar, where he had a reputation as a bully. However, unlike Puar, he can only hold a form for five minutes at a time. Perverted and greedy, but with enough goodness in him to help Goku and others on occasion, Oolong has spent much time as a companion of Master Roshi.
Oolong's name comes from a type of Chinese tea. In Dragon Ball movie #3: Mystical Adventure, his name was changed to "Mao Mao".