Vegito

Vegito (Bejitto in Japanese, Vegerot in the Viz English manga) is the fusion of Goku and Vegeta made with the Potara earrings in Dragon Ball. Two people who each wear one of a matching pair of Potara, on opposite ears, merge into a single new body whose power and personality exceed the two of them added together. When both partners are mortal the fusion wears off after an hour. Vegito is later split apart by Majin Buu's mysterious gases, the same gases that unfuse Kibito Kai between Dragon Ball Z and Dragon Ball Daima.