Attar

Also known as Lucifer, Attar is a deity that was kicked out of his heaven after trying to take over when they really needed someone to take over.

He has four wings that generally just stay as tattoos on his back, all depicting the galaxy and different parts of it. It moves, and feathers spread out over the place are white like sunlight, because he is the morning star. It was his job to bring the sun to the sky, but he doesn't do that anymore since he was excommunicated, basically.

After he was taken out, he met a girl named Lilith and they decided to date. They were very close, but after she noticed that he was asexual and didn't look at her or other people the way that she did, she got jealous and angry and literally ripped out his heart. He doesn't have a heart. 

Now he's an assassin for the rich and the powerful, his old war habits dying hard. He meets Cassie on a job while saving her, and they become quick friends. 

His oldest friend is Azazel, dating back from before he got kicked out.

He also has a friend named Heather, who is traveling with her girlfriend. Whenever they're in the city, they meet up.