Do they remind you of Hermione? Wizard has traditionally referred to a specific type of character in line with Merlin and Gandalf. Female magic users are more likely to be called a sorceress, enchantress or witch. I don't think there is a rule that wizards are male only, but almost all fictional characters called wizards have been male. Witch is (sort of) gender neutral, but male witches are called warlocks - though in Destiny, warlock is a gender-neutral term, I guess.