Lime green

You'd probably only see this shade of green hair in an anime. Since anime faces are so simple, the animators have to use cues like costumes and hair styles to make the characters distinguishable, but this might be taking things a bit too far.

ID'd by a gallery visitor as being from the series I'll make a habit of it!
 

Added: 1/27/03 From: Celga
 
Lime green