Use anything you want in any way.

  • I would have them have any colour hair apart from blond, as that's getting boring now.
  • Unless it's a women, stop making them look so pretty
  • On that note, make it a woman for once (something which they seem to have taken notice of for XIII)
  • Assuming the protagonist is a women, actually allow them to have fun once in a while (ie make them smile).