Robin's Angel

Supernatural/young justice crossover. Weird I know, but let me explain before you move on.
the only thing from supernatural are the angels, such as Castiel, Gabriel, Lucifer, Michael, and Balthazar.
However, I'm adding my own angel. Hannah Novak, guardian angel of all depressed youth. She watched over Bruce for a time after his parents died. Which Bruce? Bruce Wayne. For a couple years after his parents died, he was depressed. And he was the only human Hannah ever showed herself to. Now, a while later, she still watches over Bruce and sometimes visits him. One day she meets the teams. Both older and younger. They welcome her, but the kid team is skeptical.
Robin: Sure, she's certainly pretty enough to be an angel... but angels don't exist! They can't exist. She's just a fake! Wait, why are their wings on her back? Holy shit!
We are going with the idea that if a human and an angel are soulmates, the human can see the angel's wings.
So in this story I'm just saying that I'm going to make up my own adventures and Robin looks like Nightwing but he is still Robin. This will not follow the plot of any episodes.