8. Thunderbolts
Kurt Busiek and Mark Bagley created an incredibly unique comic book with Thunderbolts in the late 90s. A team of new superheroes that appeared in New York after the Fantastic Four and the Avengers appeared to be dead, they instantly captured the hearts and minds. But then the first issue ended with the stunning revelation that the Thunderbolts weren't heroes at allthey were the Masters of Evil in disguise. At first, this was a plot for world domination, but as time went on, some of the Thunderbolts discovered they actually enjoyed being heroes. This kind of back and forth between hero and villain was done well in the Infamous games. But now take it a step further and have an entire team of fence-straddlers at your disposal. You can switch between them in an open-world setting, both controlling individual heroes and the team as a whole. You can have Citizen V/Baron Zemo taking down Hydra goons because he wants to send a message to his enemies, or you can have Songbird/Screaming Mimi starting to lean more towards the heroic side. How the characters change should affect team interactions. A team that's distrustful of each other won't function as well as one that's perfectly in sync. And when you start bringing in other heroes who are asking questions about the Thunderbolts, what's to stop some of them from maybe seeing a way out by siding with the good guys?