According to Rin from animeDetour forums when I asked this question:
(as I'm doing Rena's school uniform)
[direct copy from her, ALL credit goes to Rin of AnimeDetour Staff!]
in Outrage or Henna-Red if you're looking for more natural look. You'll need to do a katie bair/sharpie dye meathod to get the color right but it's not that bad, there are dye tutorials in That sticky.
The key is to start from the bottom of the back and cut it to one later I then hair sprayed the heck outta my wig, flipped it upside down and blow dried. Yes this makes your wig surper fluffy but your characters hair is a spiky fro. Most of your styling from here with just be to get it smoothed down a bit. Then trim up and spray the forelocks.
I'm gonna attempt it when I order my wig...
But a question for you:
What do you think would be best to make her machete/3 foot tall axe-thing?