Dragon Ball Z begins by uncovering a whole new universe of possibilities and levels of power. The sensation with the appearance of raditz and finding out that Goku belonged to a race called Saiyans was surprising and fearful, due to the strength of this dangerous alien who appeared kidnapping Gohan.
Before Raditz, the most powerful thing we’d ever seen was piccolo and goku. And to defeat him it took an unprecedented alliance between villain and hero. Worse was when through the same mouth of the evil that threatened the Earth, we found out that there were two others that were much more powerful than him.
Those two threats that were contacted by Raditz were on another planet conquering it and exterminating their entire race, to later commercialize that world. What are we up against? Those of us who as children watched the adventures of Dragon Ball thought with fear.
That pair of warriors were Nappa and Vegeta. And in that first glimpse, the Saiyan prince appears with red hair. What happened to that feature? Doesn’t all the warriors of this race have black hair?
Why did they dye Vegeta’s hair red?
To try to hide that it had been a mistake, from Toei Animation, producers of the anime, they said that there was an element in the air of this planet that made Vegeta see red hair.
However, according to what the ETC portalit was a clear communication error between those who make the anime and Akira Toriyama’s team.
Sensei Toriyama was clear about the characteristic that all Saiyans have black hair. But those who make the anime did not know that detail. So, since the manga is in black and white, they chose to paint Vegeta with those first colors that we saw him with.