Whoh, long thread and I skipped a couple pages in the middle. Just a couple points:
EVERY player who has a female character has chosen to portray a female character, and the pronouns for females in English are she/her/hers.
EVERY player who has a male character has chosen to portray a male character, and the pronouns for males in English are he/him/his.
The player's real-life gender has absolutely no bearing on either of those statements.
If you go with the character's gender to choose your pronouns, then you are absolutely guaranteed to be correct. It may or may not be the only correct answer, but it is always a correct answer. For instance, when I (a female player) am playing Y'kayah or Navarre (male characters), then either set of pronouns is correct. (I prefer male pronouns in that case, as calling Y'kayah or Navarre "she" just sounds weird. But I can accept either as correct.) On the other hand, when I (as a female player) am playing Dylise or Tatala (female characters), then the only correct set of pronouns is the female ones. Similarly, when a male player has female characters, both sets of pronouns are correct, but when he plays male characters, only the male pronouns are correct.
So to everyone who's been arguing about what the default language usage is for when there's no information to indicate gender either way: Your arguments are irrelevant, because that's not the case here. (Well, it may be the case if you're talking about a /shout conversation where you don't see the character and can't tell from the name, but the OP was talking about when she's actually in a party with people and they still got it wrong.) If you know the character's gender, then you know of one correct set of pronouns, and another that may or may not also be correct. Go with the pronouns you know to be correct, i.e. the ones matching the character you're talking about.
Another point, this time regarding the likelihood of male players: Currently, video game players overall are only slightly more likely to be male. It's very close to half and half. However, it's the Action and Sports game genres that draw the most male players. Those two genres are overwhelming male dominated. But how do you suppose that males, who overwhelmingly dominate the most popular genre and another of the top few genres, are only barely hanging on to a majority overall? It's because other genres, like say RPGs for instance, have more female players. Face it guys, you're the ones in the minority here, and it's only the fact that most of the women you've been playing with haven't bothered to correct you that has allowed you to nurture the illusion that you're still the majority you may have been a few decades ago.