Fusions are some of the most powerful characters in the entire Dragon Ball series. This is because they take the strength of two characters and not only multiply it, but also give it an additional boost on top of that to ensure that the subsequent fusion is far stronger than either of its constituents. Though Goku and Vegeta have been the subject of many of the series' most notable fusions, Goten and Trunks have formed the fan-favorite Gotenks.