I went extreme with differentiating my elves/Faerie from my humans by creating a language (a conlang, or constructed language) for them and building a Romanized accent and dialect from it that incorporates some of their native syntax and cadence. It changes the way they speak, which changes the way they appear to think, which makes them feel exotic and alien and sometimes wildly out of touch.
Is there a place where you've talked about your process for doing this? That's the first time I've noticed a real purpose for doing a conlang, and it's got me intrigued.