Gotenks (ゴテンクス) 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.
Role in the series
Gotenks' personality is unique even though he shares personality traits of his creators, Goten and Trunks. Gotenks is known to be cocky, arrogant and mischievous like Trunks (traits inherited from his father, Vegeta), yet he acts playful and, occasionally, whiny like Goten (traits inherited from his father, Goku). Gotenks is a cocky and conceited fighter who believes his power is enough to take on anyone (much like fusee's fathers, Goku and Vegeta) even when he is about to lose a fight; this is likely due to his massive power increase during fusion, creating a warrior much like the counterpart of his fusees' fathers. Gotenks loves to be over dramatic, and shows this by calling his attacks loudly and giving ridiculous names to somewhat stylized versions of otherwise normal punches and kicks.