The Raven Goddess: Marvel/Greek mythology AU
The story of Hades and Persephone is that of a girl escaping her controling mother for a few months out of the year. It wasn't sure or not if the girl actually loved the King of the Underworld at the start but she did grow to love him. And that loved transferred into a secret child they sent up to earth to keep safe from the wrath of Zeus, for he would try and kill the child if he knew she existed.
Raven Stark knew she was adopted from a young age. She didn't look like her parents and she definitely doesn't act like her older brother, Tony, but she knew she was loved by all three anyway. So when Tony announced to the world that he was in fact Iron Man, her world turned upside down. But it's when she meets the Avengers for the first time, that she realizes that, her world is a lot bigger then she thinks.