I'm with Llama on this one. I try to be open minded, but it's just too much having a list. Like Dust said, there's a practically infinite list we could write and if we didn't fill in one that someone identified with then we might upset them, which is against the entire point of this decision. Even the pronouns, who knows how many there are out there. No matter what gender we selected too, our HA would be female or male and assumptions would always be made.
I think there's a simpler solution. Stick with male and female, but include an "other" selection as well just for what shows up on your profile. Maybe include "undisclosed" that's fine too if we want to keep it quiet. Then, have the HAs not connected with the gender on your profile. Then you can switch between HAs (first of all, very useful for gender fluid individuals) or pick which you want.
As to the pronouns and gender you want to be identified as? That's the very definition of what your profile is for. Just put it up there in the HTML/CSS box and bam! Everyone knows what you want to be identified as and what pronouns you like. You don't even have to know CSS or HTML for it. You can just have it plain text and that's fine too. If it's important enough to make a giant list on signup of any sort, I think that the individual can put it on their profile and when someone sees "other" they'll know they have to read the profile or just guess (if there's nothing on the profile). Besides, you can explain 100 times better exactly how you want to be identified using your profile than a single word identifying your gender ever could. Even a list of pronouns isn't as good as a short deion on the profile. Since we have to go to the profile anyway to see the gender (other than on forums with HAs but that wouldn't be solved by any of this stuff that's been discussed anyway) it's not like it's that much more work for the user that's curious.
Edit: I also agree that this is a game and can be treated as such and the character you make doesn't have to be you, but I have less standing to argue that point since I'm a female and have always identified as female.