9. The Runaways
This one is already potentially in the pipeline. Kevin Feige, President of Production at Marvel Studios had this to say on the matter:
"It's a matter of where it fits. Runaways sort of falls in between those in a way. We just haven't found where or how to do it... right now. I'd love to do it someday."
The Runaways themselves are a unique hero group in that they're a group of teenagers who discover that their parents are part of an evil crime group called "the Pride". Originally, the series featured a small group of six kids whose parents routinely met every year for a charity event. One year, the kids spy on their parents and learn that they are indeed the Pride, a criminal group composed of a mixture of mob bosses, time-travellers, dark wizards, mad scientists, alien invaders and telepathic mutants. The kids steal weapons and resources from their parents and learn that they have inherited their parents' powers, leading to all kinds of adventures.