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Uub

  
Uub (Ubu), known as Oob in the Viz manga and in Japanese versions, is the reincarnation of the evil Majin Buu. After Kid Buu is destroyed, Goku asks him to be reincarnated as a good person, so they may battle again. King Yemma overhears the request and complies with it. Goku eventually senses Uub's hidden power, and seeks him out when Uub attends the tournament to gain money for his village. Goku ends up deciding to train him to be Earth's new guardian and as an opponent that he can battle. In Dragon Ball GT, Mr. Buu enters Uub's body, making him into "Majuub" to face threats such as Baby, Super #17, and Omega Shenron.

Upa

  
He comes in Dragon Ball. Upa live below Karin's tower, Bora was killed by Tao Pai Pai, and Goku feling responcible helped Upa to revive him with the Dragon Balls. They also are the ones who told Goku how to climb Karin's Tower - although the two are quickly relegated to side cast they have a big role in the Red Ribbon Army saga of Dragon Ball.