My favorite playable race, hands down, is the Tiefling.
They aren't straight up half demon or devil, just....a little off. Something wrong in the family woodshed, as it were. Or right, depending on your alignment.
One reason they're interesting is yeah, they can be evil. You could be evil willfully, or as the product of your environment, whatever. But. They can be good too (or chaotic neutral, frequently a fun one). But their appearance is an immediate count against them. Walk into a room or down the street as the one with horns, and there's going to be whispers and opinions immediately formed. And that can bring an interesting dynamic to the person you're playing.
