10. GT Saga Characters
Dragon Ball GT may be the black sheep of the series, but noone can deny that it has some pretty sweet characters.
Considering FighterZ focuses mostly on the characters of Dragon Ball Z, it's not really surprising that GT doesn't make any appearance whatsoever. However, not having GT also means that players don't get to have Super Saiyan 4 Goku and Vegeta, Majuub or even great villains like Baby and Omega Shenron, all of whom have a great variety of abilities and special moves.
The most glaring omissions are certainly the Super Saiyan 4 transformations of Goku and Vegeta, as both have been pretty popular inclusions in prior Dragon Ball titles. The two of them could play as a team, similarly to Android 18 and 17, with their final attack being a fusion into Super Saiyan 4 Gogeta. There is so much potential in their moveset that not including them in FighterZ is a real shame.
Although there is some small potential for GT characters to appear in FighterZ as DLC, the already pretty limited roster would be made all the sweeter if they had been there from the start.