The other character, however, does not need to be in base form. Gogeta from the GT era works a little differently, since you need both Goku and Vegeta to be in Super Saiyan 4 form. In terms of DP ...

Fusion methods differ: Potara vs. Fusion Dance Personas vary: Vegito is strategic, Gogeta is direct. Abilities and forms: SSJ4 Gogeta is strongest; Vegito lasts longer Each fight in the Dragon ...