I've always loved Stardew Valley, and after moving to college I couldn't play because I don't have a laptop that supports steam—until the mobile app came out! I was very excited, but a little disappointed when I was making my character and male and female were the only options. I would love for a 3rd option to be added for gender (I would say "other" is fine although nonbinary would also work), with they/them pronouns and minor changes to the dialogue in the game so they're not referred to as specifically male or female. As for customization, the base sprite is already pretty neutral and there could just be a blend of the already available clothes and haircuts (assuming they even differ with the gender picked, because I haven't check). I love that Stardew Valley's romances are queer-friendly, and I think this would be a nice gesture to those that don't identify within the gender binary!