Well you can change the depth and intensity of the redness (I sound like I'm talking about photoshop). There are colors all over the rainbow and with an RPG with so many characters (including NPCs) so it wouldn't be unusual for one person to have the same hair color.
In general my character's hair isn't firey red, as that would emphasize more ambition and excitement. Her hair is more the type that flows and "permeates", so to speak, like pulsing blood, giving more of a feeling of repulsion yet mystification.
...if that makes any sense. :V Did you see the PM I sent you? Just wondering.