Android 8

Jinzouningen Hachi Gou "Artificial Human Number 8" AKA Hachan- Dr. Gero's first "successful" creation, (although there was a BIG plot hole in the anime that said Dr. Frappe invented him). While Number 8 was magnificently powerful, he was built too well and possesed the ability to think for himself, and he decided that he didn't want to do evil things for the Red Ribbon Army. He befriends Gokou and helps him on his trip up Muscle Tower. Hachan was much stronger than Gokou at that particular time, but he was a pacifist, and didn't like to fight. He had a bomb inside his body which could be activated with an Emergency Stop Controller. Murasaki was going to kill Hachan by activating the bomb since he was defective, but Gokou saved him by destroying the controller. Hachan can also be seen near the end of DBZ and also in the Dragon Ball 10th Anniversary Special.