First of all I would like to apologize for not being able to put this into the story, and feel free to comment any recommendations for this particular character's behavior, looks ect.
Appearance of

Mortem is tall,with brown hair and a scraggly half shadow of a beard (did anyone out there get that refrence?), he wears a black hoodie and jeans, his skin is very pale.His eyes glow an unnatural blue colour.As for his wings, he hides them whenever humans are near.They huge angelic wings with the wingspan of a small car.
Behavior

He often keeps to himself, not much is currently known about his past.He won't take shit from anybody but he is still sympathetic.He hides in the shadows a lot, but there is a bit more to him than you think and I won't spoil what it is.

Anyway, if you have any suggestions feel free to comment, also, should I do a character description for Night.And thanks for reading :D