Why did Gold Saints Sagar in the myth of the holy garments have a blond hair?

This is because of the so-called "animated version" and "primary color version" in mythology. (The so-called primary color version is also called the original color version of comics.)

When Masami Kurumada painted the original cartoon of Saint saint seiya, because it was a black and white manuscript, there was no obvious difference in the color of the characters' hair except black and white. On his few color pages, there are very clear color expressions. In the animation, there are colorful hairs between each character.

In order to get more benefits, Bandai has produced various versions (in fact, it is just a different color).

PS: By the way, there are several obvious differences. The instant hair is light yellow in the cartoon (this is clearly written in Ikki's lines when he wears it on Bruto instantly), but it is full of green hair in the animation; Miro cartoon version of the color page is golden yellow, to the animated version turned blue-purple; Ka Miao's cartoon version of the color page is red, but it turns blue-green in the animation and so on ~