In The Avengers, Nick Fury talks about an idea. The idea to bring together a group of remarkable people, to see if they could become something more. And it worked, despite there still being a number of unused Marvel characters on the bench. The Avengers Initiative, as we've seen in the Marvel Cinematic Universe, is palatable and marketable at its core, but it is frankly missing out on some of the coolest Marvel characters to ever grace the shelves of comic book stores.
With the conclusion of the Infinity Saga, Marvel Studios (and Disney) are starting to take much larger risks when it comes to creating content with their myriad characters now that they have cemented their place as one of the most successful film studios in history. Here are the top Marvel heroes that are not (yet) in the MCU - vote for the best non-MCU Avengers characters.
Moon Knight has been a long-time favorite for Marvel fans and is presently in development for Disney+. Marc Spector was a soldier who perished and was brought back to life by the Egyptian god of vengeance, Khonshu. Additionally, due to traumatic events of his youth, Spector suffers from dissociative personality disorder.
This would be one of the MCU's first superheroes with a mental illness that could be talked about on screen, providing a much-needed form of representation in an otherwise barren field of radically "perfect" heroes.
After receiving a blood transfusion from her cousin Bruce Banner, Jennifer Walters undergoes a similar transformation to the OG Hulk. Her transformation is permanent, similar to Professor Hulk in Avengers: Endgame. Over her comics history, she's been both a supermodel and a skilled lawyer, often acting as legal counsel for the Avengers.
In addition to the Avengers, She-Hulk has been a member of the Defenders, Heroes for Hire, the Fantastic Four, and S.H.I.E.L.D., and she's a founding member of A-Force.
Spider-Woman is surprisingly not the female equivalent of Spider-Man. In the '70s, Marvel created the character when two parents tried to cure their daughter, Jessica Drew, after long-term exposure to Uranium. Her father, geneticist Dr. Jonathan Drew, injected her with a serum made from the blood of spiders in the hope that their regenerative properties would act as an immunization to further damage.
When Jessica was a teen, she briefly joined Hydra, which tried to train her as a hitman for the organization. Once she realized the nature of the organization, she escaped, slaying her mentor and eventually joining S.H.I.E.L.D.
Nova and the accompanying Nova Corps are basically Marvel's answer to the Green Lantern Corps, and they're arguably more effective. Making their home on Xandar, the Nova Corps has already been established in the MCU, as seen in Guardians of the Galaxy, and was both snapped and snapped back to reality in Avengers: Infinity War and Endgame, respectively.
Marvel has given the Nova mantle to a few characters throughout the comics and we have already seen two potential mantle-bearers in Guardians of the Galaxy in both Irani Rael, played by Glenn Close, and Rhomann Dey, played by John C. Reilly. While both of these less conventional casting choices would be incredible, there is a strong chance that if Marvel Studios ever makes a Nova film or limited series that they would go the Samuel Alexander route and cast a young actor in their teens or early twenties.