Dozens of Dragon Ball GT references have already been found in the Super Baby 2 and Super Saiyan 4 Gogeta trailer for Dragon Ball FighterZ

Many attacks in Dragon Ball FighterZ clearly take references from the manga, anime and movies featuring the Dragon Ball universe. It seems that Super Baby 2 and Super Saiyan 4 Gogeta from Dragon Ball GT also feature attacks and techniques

How many Gokus are in Dragon Ball FighterZ? - Quora

Gogeta, Dragon Ball Wiki

Dragonball FighterZ - Gogeta Super Saiyan 4 Showcase

The one who held the title of the strongest character in all of dragon ball for 16 years. : r/Dragonballsuper

UPDATED 12/21] Super Saiyan 4 Gogeta, Super Baby 2 to complete DBFZ Season 3 FighterZ Pass - Inven Global

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Some more Gokus we can look forward to in the future : r/dragonballfighterz

Dragon Ball FighterZ - The Cutting Room Floor

Dragon Ball FighterZ – Official Gogeta SS4 & Super Baby 2 Reveal Trailer - IGN

Dragon Ball FighterZ - The Cutting Room Floor

Baby, Dragon Ball Wiki