You didn't have to reveal your true gender or personality or pretend to be something that you're not (I prefer to be "upfront" - I'm a heterosexual adult male IRL). I find that most peeps online, including myself, tend to accept strangers at "Face value" (That's not to say that I would be so naive, IRL). If someone tells you that what they claim is their real gender, age, sexual orientation and/or personality and does not appear to be honest about it (There are ways to tell), it is not feasible (Though possible) to find out the truth (There are pay sites that can verify, for a fee, the first two statistics based on a person's credit card number or other personal data). Also, remember rules 29 and 30 of the internet! ->
http://rulesoftheinternet.com/. Even if the other person is lying to you about him/herself, I find that if you just go along with everything then they will go out of their way to maintain that illusion/appearance/persona for you as well. There should be no harm in all that as long as it is for social entertainment purposes only (It's kind of like RPing but in online life). I've seen some people here claim that they're a male/female pony (MLP) or some other kind of furry creature and that they're hetero/homo/bi/transgender/pansexual (I have yet to meet an
asexual person but I know that they do exist), so obviously you can't believe everything that you see over on the 'net!
Sorry to hear that you have autism. Would you consider yourself a
savant when it comes to programming? - Not everyone can make a living as a game programmer, much less an indie game programmer on Steam, Itch.io or GOG ->
https://www.gog.com/indie.
If you really want to pass yourself off as gender neutral then I would agree with your current choice for an avatar. Another gender neutral character is
Crona from Soul Eater.