Oolong

Oolong (ウーロン) is a protagonist in the Dragon Ball manga and its anime adaptation Dragon Ball, making minor appearances in Dragon Ball Z and Dragon Ball GT as well. He is an anthropomorphic, shapeshifting pig who met Bulma and Goku while on their quest finding the Dragon Balls. After their adventure, he begins living at Capsule Corporation in West City. He plays a large role in the beginning of Dragon Ball, but by the end of Dragon Ball Z, he just shows up from time to time in the company of Master Roshi.