My sona is from a custom species that in the story is a type of demon I call "spirit". Spirit demons have stronger spiritual auras than other kinds of demons and as a trade-off they are physically weaker. In her particular species' case the difference is not much - they are still very capable of physical brawls without losing out on spiritual capabilities due to the ancient nature of their heritage. I'm debating some other things, but right now that's what I've got.
All absolutely optional since I haven't gotten a chance to utilize these ideas in RP or writing, there are two options I'd be more than willing to take when it comes to my sona having powers.
1. Basically him being a bard and casting spells as he sings and plays a guitar.
2. Something along the lines of the PSI abilities in the MOTHER games (MOTHER/Earthbound Beginnings, MOTHER 2/Earthbound, and MOTHER 3). There's some interesting stuff in there that sounds like it's be a lot of fun to incorporate into some type of writing.