Think things through and just have fun with it tbh. I love playing non-humans because it's so interesting to me to explore the ways things can work totally differently from what we humans take for granted every day. If your character is very different from humans physically, think about what daily life is like for them, especially among humans in a place designed for humans. And the unusual responses to things like the anon above is talking about can really shake things up.

At the same time, part of exploring the differences is finding the similarities and having fun with that too. They should still be a complete and nuanced person, relatable on some level even if their ways of thinking are somewhat alien. You don't want a one-note character who does nothing but show off how exotic they are; think stuff out for yourself, but just address it in threads when it comes up organically. (Playing off your character's unique properties is a fantastic source of posts/toplevels/prompt responses, but if it's all you do it'll still get stale.) Likewise don't overdo the alien responses and thinking just for the sake of being different, make sure it's actually what the character would do.