Oolong is a shape shifting pig from Dragon Ball. He attended the same shape shifting school as Puar and bullied her. After he was kicked out for stealing the teachers panties he terrorized Aru Village taking young daughters of the villagers. He can shape-shift into any creature, like a red ogre, a French accent man, a bull, a robot, a bat, and even a missile. He was stopped by Goku and was forced to join Goku and Bulma on their quest for the dragon balls and ended up befriending them.
           Dragon Ball Villains

Dragon Ball
Pilaf Gang
Emperor Pilaf | Shu | Mai

Red Ribbon Army
Commander Red | Assistant Black | Captain Dark | Captain Yellow | Colonel Silver | Colonel Violet | Major Metallitron | General White | General Blue | Murasaki | Buyon | Hasky) | Tao Pai Pai

Crane School
Master Shen | Tien Shinhan | Chiaotzu
King Piccolo's Demon Clan
King Piccolo | Tambourine | Piano | Cymbal | Drum | Piccolo Jr
Bacterian | Bear Thief | Giran | Launch | Monster Carrot | Octopapa | Oolong | Pirate Android | Puar | Spike the Devil Man | Yamcha

Dragon Ball Super
Champa | Frost | Goku Black | Zamasu | Quitela | Zen-Oh

Video Game Exclusive
Towa | Mira | Demigra