Iron Man/Tony Stark: A billionaire playboy philanthropist in a powered exoskeleton.
Captain America/Steve Rogers: A WWII super-soldier enhanced in strength and durability.
Thor: The god of thunder from the realm of Asgard who wields a mystical hammer called Mjolnir.
Hulk/Bruce Banner: A brilliant scientist who suffers from a condition that transforms him into an unstoppable raging monster.
Black Widow/Natasha Romanoff: A trained assassin whose deadly talents help to keep Avengers missions on track.
Hawkeye/Clint Barton: A master archer trained to accuracy of the highest level on multiple types of bows and arrows.
Loki: The brother of Thor, often the Avengers' biggest enemy, but the two later have a complicated but deep bond of love for one another.