I'm partial to long, straight, relatively naturally coloured hair in various styles. There are some very cute anime girls with short hair as well though. It really depends a lot on whether the hair fits the character and the show they're from. Mai Tokiha and Sheryl Nome are my favorite anime girls and neither of them has long, straight, naturally coloured hair. :lol:
All that being said, I do have to give special mention to the character of Sun Yun Mei (AKA "Yun Yun") from Canaan and her unusual hair style.
Spoiler for Images:
C'mon, if you met someone with hair like that, you'd do this too.
Note:Images are from
this blog post and
this one, because I don't know how to take screenshots in PowerDVD and my Canaan bluray won't work with CCCP.