It seems like the blonde Ayu is more appealing to fans
I don't think she looks like a teeny bopper right now. I like her dark hair, not only because it's closer to her natural roots (and mine! LOL!), but she pulls it off great, and it's the ugly winter time, .. and she makes dark colors look good, especially during the winter.
Although, I do see her changing her style again soon! That's Ayu anyways