They WERE. ._....lol. Even Sega copied of them! Super Sonic, hello??
Kaio-Ken - Red aura, bulky muscles.
Super Saiyan - Blonde hair, green eyes, yellow aura.
SSJ2 - Spiky golden hair, electricity.
SSJ3 - Long golden hair, epic eye brows, eye's changed, electricity.
SSJ4 - Red Fer, Black long hair, Yelloish eyes, Tail returned, Literally a "monkey-man"
SSJG - Red hair, Red eyes, Similar aura to Kaio ken.
I'll admit, compared to Naruto, they seem bland, but their concept was groundbreaking in the 90's.