Advice on pronoun use for non-human characters?

Choice of Robots pronouns are made up though, aren’t they? As opposed to any of those provided on the list here say Gender neutrality in languages with gendered third-person pronouns - Wikipedia

I think this isn’t so relevant in a game where almost all of the characters are demons. However, it’s definitely a valid point otherwise.

Choice of Robots and their robot pronouns, but binary for humans. Heroes Rise and the zehir, and negating your own gender choice. If I wasn’t supposed to be working I’d write a little more.