18) Doctor Strange
Traditionally, Marvel’s Sorcerer Supreme has been more of an ally to the Avengers rather than an actual member. He was originally a founding member of the Defenders, after all. In recent years, however, his role on the roster has increased. Most notably, he joined Cap’s anti-registration Secret Avengers in Civil War and even let them use his Sanctum Sanctorum as their HQ. After that, he was an on-again, off-again New Avenger. Stephen Strange will no doubt become a member of the team in the movies as well, with the upcoming Avengers: Infinity War.Â
17) Quicksilver
As the son of Magneto, Quicksilver has had a chequered past to say the least – he started out on his father’s Brotherhood of Evil Mutants and later played a key role in the destructive “House of M” saga. Still, Pietro Maximoff has also fought the good fight for a great number of years to make up for his sins. Though he is a mutant (well, most of the time), and has served on the X-Men roster on occasion, he’s probably most familiar as one of the Avengers. Not that you’d know it from the movies’ depiction of the character, though.