Dragon Ball V

Dragon Ball V is a Japanese manga.

Synopsis
Set 2 days after the finale of Dragon Ball Z, Son Goku begins to train Uub to become his spiritual successor.

Main

 * Uub - the reincarnation of Majinn Buu who aims to keep the world safe from evil, being trained by Goku to reach his goals.
 * Son Goku - a powerful Saiyan who has retired his adventurer and hero status in favor of training Uub to become a warrior.
 * [3, 4 or 5 more main characters]