Aye, so after a year and a bit, I'm finally posting sth here :)

I drew a ref sheet for my sona Sketch, main part of this ref sheet is this fullbody of them which I really like actually!

They once were a demon but are now as a nature spirit dedicated to the protection and care for lost souls and the environment they settle in.
That means he cares not only for lost/lonely souls but also for the living around them.