As we all know, the Saiyan race trade their black hair for blond locks (as well as sporting bluish-green eyes) when they transorm into their Super Saiyan forms in Dragon Ball and its various spin offs. The color change is a great way to visually differentiate the two forms, but why the switch to blond hair, specifically? Well, Weekly Jump editor-in-chief Hiroyuki Nakano recently explained why on Japanese TV (via Kotaku) and the reason is really quite practical.
According to Nakano, because the original Dragon Ball manga was black and white, creator Akira Toriyama “wanted to eliminate the time spent coloring in black [hair].” Nakono also added that coloring in Saiyan hair is “tough work,” so by leaving it uncolored in the original black and white manga, (which appears blond in the color versions) Toryiyama was able to lessen his workload.
“For a serialization that’s published weekly, each minute and every second is precious,” Nakano said. “Even trimming only a little bit of time means more time can be spent on the story and drawing cool art.”
So there you have it: Super Saiyan’s blond hair was created in the interest of efficiency, not because it looked cool. That was just a bonus!