Game designers do a lot of writing. So do teachers. And students, for that matter. So, I thought this writing tip that I picked up at Origins would be useful to most of you. (If only I had known this before finishing the writing on my textbook. Well, there's always 2nd Edition...)
Gender pronouns are always tricky. Use a gender-neutral he/his/him all the time and you've unwittingly added male gender bias (this is particularly insidious in game design documents, if you inherently assume the player is always male -- which perhaps explains why there are so many female characters in games wearing chainmail bikinis). Use she/hers/her and it looks like you're using feminine pronouns just for the heck of it. The dual him or her / he or she is unwieldy. The slash-based s/he looks ugly. The fusion hir looks downright alien. What's a writer to do?
Here's a simple solution: make it contextual. Use male pronouns for certain kinds of things, and female pronouns for others, and use them consistently.
The example given at Origins was in the writing of a rulebook for a tabletop RPG. The designer used female pronouns for the GM and male pronouns for the players. This not only caused the writing to be more gender-balanced, but also made the manual easier to read because it was clear who each pronoun was referring to!