Yamcha (ヤムチャ, Yamucha?) is a fictional character from the Dragon Ball universe created by Akira Toriyama and developed into a media franchise, which consists of a series of manga, anime, soundtracks, movies, television specials, video games, and other collectibles. He is introduced as a thief and started out as an antagonist of Son Goku but eventually reforms and becomes an ally and Z Fighter. His constant companion is Puar. His seiyū is Tōru Furuya. In the English dub, he is voiced by Ted Cole and later Christopher Sabat.

Source: Wikipedia