I'm going to foolishly wade into this thread once more and see if perhaps, I can be more clear.
I come to the table with a character (we have, at this point, reached Hussar's "cypher" point). Through simple introduction, I explain the character is an elf, and female.
NOW! I have established that my character is not myself (a male human), from this point forward, the presentation of this elf female is largely in my hands. If I am playing a fairly culturally-normative elf female, then per @
MechaPilot this character should uphold certain established cultural norms and values. I may need some assistance from the GM from time to time since me, the IRL male human, wouldn't know the ins and outs of the elf society I come from, or how women are treated and behave in that society.
BUT! It is highly common for adventurers to be
exceptions rather than norms. Perhaps I have a particularly stronk elf, who is a bit of a pyro that likes getting drunk and generally being loud. Most people, regardless of the particulars of any homebrew elf-culture, would compare that to traditional elf cultures (such as portrayed in Tolkein) and agree that's not normative. In fact, that's probably not even normative for IRL human female culture (though it's certainly more possible now than it was before). But more to the point, being strong, enjoying lighting things on fire, getting drunk and being loud are not elements that most people would immediately identify as female.