Check out this video to learn all about the different forms and all the hair style and color changes that come with them. Find and save ideas about goku hair colors on Pinterest. For Saiyans, who have instinctive advantages when it comes to manipulating energy, this shows up as different colors.
Super Saiyan energy is a golden. Goku would secretly achieve Super Saiyan 3 while training in the afterlife, enlarging his brow and making his golden hair grow down to his waist. The now non-canon Dragon Ball GT had Goku and Vegeta transform into Super Saiyan 4, their torsos covered in red fur while their longer hair reverted to its natural black.
Black: Back to the natural base-form color for Super Saiyan 4 in GT. At least for Goku, while Vegeta's is more of a very dark brown. Red: Gogeta's version of Super Saiyan 4, for some reason, as well as Super Saiyan God in Battle of Gods and Super.
The Super Saiyan 4 transformation seen in Dragon Ball GT had distinct hairstyles for Goku and Vegeta. Goku's black hair extended downward, while Vegeta's stayed true to his regular hairstyle with slight brown coloring. Other variations, such as Baby Vegeta's white hair and unique Shape, added an extra level of diversity to Saiyan hairstyles.
Goku's blue hair is an iconic feature of the anime Dragon Ball. The unique color choice adds a creative flair to the character's design, reflecting his powerful energy and alien heritage. Goku will acquire Ultra Instinct-Super Saiyan, getting brown SSJ hair to match Oozaru (foreshadowed by him getting in touch with Saiyan roots to use UI in the Granolah arc).
As Goku went Super Saiyan 2 and 3, his Aura became more and more golden in color, with Super Saiyan 3 revealing a deep yellow Gold Aura. This Aura is the reason why a Super Saiyan's hair changes. Then they dig deep and start radiating energy and then their black hair turns bright blond.
Hiroyuki Nakano, the editor of Weekly Shonen Jump, explains "It's a lot of work to color Goku's hair black.