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

Gogeta, Dragon Ball Wiki

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

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Gogeta, Dragon Ball Wiki

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