Character from the same universe as Morgan, Kalzfir ect.

Morgan, being a sneaky little bitch. Created a portal to the lower levels of Heaven. Using various sacrifices for the job.
She stole a key to the upper levels, which Aria was supposed to be guarding. Got in to said upper levels, caused some damage, stole some things, set some angels on fire, then left again.

Aria was assigned the job of getting the key back from Morgan, and was sent to the human world (Morgan having fled there) to retrieve it.

Aria failed, (in other words Morgan kicked her ass). When Aria returned without the key, she was banished back to the human world.
Now she's seeking Morgan out, to get revenge.
Her black hair, and tainted wings are signs of her banishment.

An Angel's skin has less variety than a demon's skin, while a demon's skin can be any shade of green, blue, red or black. An angels skin can only be blue, or white. As well as their wings. Their hair can also only be blonde or white.
Whereas a demon's hair can be any color.

Ohman fff I've had this character in my head for a while now, I was debating whether or not I'd actually use her. But decided I would, because she's a fun character, really.