User blog comment:Staraptor Kwan/Why has there not been a green-haired main character throughout the Aikatsu franchise?/@comment-29752621-20170109231357

I would have never noticed this! After looking at your palette it feels like some colors of hair get close to green (like brown) but not quite (I'm bad at identifying colors)

After looking at all the characters it's quite clear that there is a distinct lack of green.

I don't think I'd mind if it was just for the sake of checking off "make a character's hair color green", but these extra colors, like in the palette you provided, adds lots of extra potential for diversity.

Even in the secondary cast, there doesn't seem to be a lot of green.

Although not a main character, here is an example of a Stars secondary character with green hair that might give a feel for a future one: http://aikatsustars.wikia.com/wiki/Ayumi_Naruse