An unpredictable fusion
Gotenks is the result of the fusion between Son Goten, the son of Goku, and Trunks, the son of Vegeta, in the manga and the anime Dragon Ball Z. This technique was suggested to them by Goku to fight Boo and they were trained by Piccolo. Unfortunately, both boys being children when they first try it, Gotenks ends up inheriting the worst qualities of both boys, even though he seems to be dominated by Trunks. He is rude, selfish and far too sure of himself, which makes for some comical fight scenes with Boo. But finally, with time Gotenks decides to train more seriously and reaches the state of Super Saiyan 3, which had only been achieved by Goku before.