Gabriel wasn't exactly a fallen angel. He was a good soldier to his Father, so why was he down on Earth, unable to get back to Heaven? Gabriel realized his wings were hidden, and unable to invoke them.

When you stumbled upon Gabriel, who was trying to pull himself up in a dark corner of an alley, he looked up at you with big, innocent eyes, sensing that you weren't exactly human, and unaware of it...

The angel watched as you approached, his eyes following you carefully, curiously.