Oolong

Oolong (ウーロン, Ūron) 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. Oolong is the one who made the wish which created Oceanus Shenron, a Shadow Dragon who appears in Dragon Ball GT.

Oolong's normal form is of a humanoid pig, standing about three feet tall with pale pink skin. Initially, he dressed in the stereotypical clothing of the Communist Party of China, although later he tended to dress in trousers, button-down shirts, and suspenders.

The fact that Oolong is a pig wearing a Communist Party of China outfit implies Akira Toriyama's message behind this character. Also, Oolong has a darker attitude in his early appearances. This whole concept is dropped with the beginning of the 21st World Martial Arts Tournament.

Like Master Roshi, he enjoys smoking cigars and is a pervert, but considerably less so. His favorite hobby is collecting women's underwear. Oolong is cynical and cowardly, and he is not hesitant to admit it; in fact, he is downright proud of his wimpish traits. Ironically Oolong is three years younger than Goku, Bulma points this out with the line "what kind of kid acts like a middle aged pervert" in the Japanese version of episode 6 . A running gag in both Dragon Ball and Dragon Ball Z is Oolong constantly being beaten up by Bulma during the World Martial Arts Tournaments due to her anxiety over the fighting (at one point, he tried to protect himself with a helmet). He is also there to provide comic relief and is often very sarcastic.


Information from:
http://dragonball.wikia.com/