Well, reading this thread, i can see you want to know how you should include a non-binary option for the protagonist, or even if you should. Being non-binary myself, i like to have that option anyway, even if the difference is purely aesthetic. As someone already said, that can make a great difference to the player, even if their gender doesn’t make a difference for the game, it is a question of identity, and if the protagonist is supposed to be the player itself, no matter how superficial you think it is, it is purely for the sake of the immersion the person must have. Not including the option to be non-binary would be the same thing as not including the option to be female or the option to be male, and i think you can see how that would be a problem.
But, apparently, what the player is would make a difference to the world around them, in your game, and i like that. I am happy when i have the choice to be non-binary in a CoG game, but most of them that have that option don’t take your gender in consideration at all(i mean, i would like to live in a world like that, but it is too detached from the reality i live in, and even fiction needs to have some roots in reality so that it can engage people reading it). Now, if you want to know what you should do in your game to portray a non-binary protagonist in a way that makes a difference, i can only say, being non-binary myself, what i think you should do:
People judge others by superficial characteristics, mainly appearance. You could make the assumption that players who choose to be non-binary would have a character with an androgynous appearance, so the world’s reaction to them would play out according to that. By my experience, some people could assume they’re male, others could assume they’re female, others would avoid referring to them in a way that assumes their gender, and some people would outright ask. The tricky thing here would be how the player reacts to these situations, because obviously not everyone would respond the same way, and may even act differently depending on the situation. It can be really hard to explain to someone that you are neither a man nor a woman, some people aren’t even capable of understanding that, and others think that gender = the sex your body has.
Now, you could also give the option for the player to choose if their appearance makes people think they’re feminine, masculine, or androgynous. With androgyny, there is what i said above. With feminine and masculine, some people can accept being viewed that way because it is unreasonable to expect that everyone will understand how they feel about it, depending on the situation, it is just way too much trouble.
I think trying to cover every variation of how a non-binary person can react to a situation, or how the world reacts to them is pretty much impossible, so, i will try to explain about being non-binary: People will judge others by appearance, so if you are trying to simulate reality, keep that in mind. Speaking for me, i identify as non-binary because i am against the very concept of pre-judging people because of their sex, gender, or appearance: Yes, biologically, sex does make a difference, in the sense that if they had a different body, they would be kind of a different person. But that is irrelevant, as people vary so much that you can’t assume a single thing on a person based on that. So i imagine any conflict with a non-binary protagonist about their gender would be with characters that don’t understand or have a misconception about the things i just speaked about. I hope that gives some insight on how you should approach this option in your game.
On a side note, what about hermaphrodites? I only played one text game that gave me that option, so i long for seeing the option to be hermaphrodite in more games…