personally, even if she's agressive and stuff, I see her as a female. I think she does become quite "male"ish when his/her friends are acting stupid again. But if (s)he is male why would haley go in the same room when they go at an inn or similar?

also some considerable evidense is on the OOTS comic #123.

therefore, my point of view is that either V is a female, an "it" or...likes guys...