Gotenks

Gotenks (ゴテンクス Gotenkusu), previously known as Trunkten, is the immensely powerful result of Trunks and Goten successfully using the Fusion Dance, and the first successful fusion dance character to be seen in the Dragon Ball series. He likes to call himself, "The Hero of Justice" or "Grim Reaper of Justice". Gotenks is a fusion taught to Goten and Trunks by Goku, and is later trained by Piccolo. He is one of the fusions performed through the use of the Fusion Dance technique. The dance is a special type of fusion ability, a connection through the fusees' fingers. The fusees need to perform a special type of pose, then connect their index fingers evenly to produce a perfect fusion. He, like Gogeta, is summoned out of desperation to defeat powerful enemies. In Gotenks' case, this enemy is Majin Buu and later in the saga, he is to be used by Super Buu as his main power source when Gotenks is absorbed. He is seen a few times in Dragon Ball Z and the movies (debuting in Dragon Ball Z: Fusion Reborn).