As a combination of Goku and Vegeta, Vegito is one of the more popular fusion characters Dragon Ball franchise. That said, this hasn’t really translated into him being used a lot in Dragon Ball FighterZ.
That’s not to say that Vegito (SSGSS) isn’t able to pull his own weight in this game. For any players looking to try out this fusion in Dragon Ball FighterZ, combo genius Final Showdown has shared a video exploring the maximum amount of damage that Vegito can pull off using his bread-and-butter combos. The combos here are practical ones that are meant to be used in a real match; as such, Final Showdown shows multiple ways that these combos can be started, and how much damage each starter gains or loses.
Source: Final Showdown