<P> Dragon Ball GT chief character designer Katsuyoshi Nakatsuru said he agonized over designing Goku 's Super Saiyan 4 appearance , which was the idea of the show 's producers , questioning whether it was necessary to go further with the transformations . Because Super Saiyan 4 is brought about while in a Saiyan 's Ōzaru ( 大 猿 , lit . `` Great Ape '' ) form , he made the hair more `` wild '' and covered Goku 's body in red fur . There was only a single final draft of the character , although Nakatsuru did consider making the hair blonde , he ended up choosing black as it provides more contrast with the red fur . </P>
when did goku first go super saiyan 4
Dragon Ball GT