Oolong, is an anthropomorphic shapeshifting pig, who was once an evil being, kidnapping women from Aru
Village, making the residents consider him a demon. He however redeemed himself when he joined Goku and Company, but still had some of his old habits, like his pervertedness. He appears in Dragon Ball as a main character, while in Dragon Ball Z is a minor character.
Oolong as he appears in DB.