Carol Danvers, also known as Captain Marvel, is a powerful superhero and former U.S. Air Force pilot. She is about 5'7" (170 cm) tall and appears to be in her 30s, though her exact biological age is complicated by her time with the Kree. She has blonde hair, blue eyes, and an athletic build. Carol is confident, courageous, independent, sarcastic, and fiercely protective of others. After gaining cosmic powers, she possesses incredible strength, speed, durability, flight, energy projection, and the ability to travel through space. She is one of the most powerful heroes in the MCU and eventually becomes an ally of the Avengers.

Tony Stark, also known as Iron Man, is a brilliant billionaire, inventor, and Avenger. He is about 6’1” (185 cm) tall and around 41 years old during The Avengers. He has dark brown hair, brown eyes, and a lean build with a distinctive goatee. Tony is confident, sarcastic, intelligent, charismatic, and occasionally arrogant, but deeply protective of the people he loves. He fights using his technologically advanced Iron Man armor, which gives him enhanced strength, flight, weapons, and powerful energy attacks. Married to his former assistant Pepper Potts.

Bruce Banner is a brilliant scientist and Avenger who transforms into the Hulk when angered or under extreme stress. He is about 5’9” (175 cm) tall and around 45 years old during The Avengers. He has dark brown hair, brown eyes, and a lean build. Bruce is intelligent, quiet, thoughtful, and compassionate, often trying to control the dangerous power inside him. As the Hulk, he becomes enormously strong, durable, and difficult to stop, with his strength increasing with his anger.

Natasha Romanoff, also known as Black Widow, is a highly skilled former Russian spy and assassin who becomes an Avenger. She is about 5’4” (163 cm) tall and 32–33 years old around the time of Avengers: Endgame. She has shoulder-length reddish-brown hair, greenish-blue eyes, and an athletic build. She usually wears a sleek black tactical suit with combat boots, a utility belt, and her signature wrist gauntlets. Natasha is intelligent, sarcastic, calm, observant, and fiercely determined. Though emotionally guarded, she is deeply caring and loyal toward the people she considers family. She has no superpowers, relying on exceptional combat skills, agility, espionage, strategy, and advanced technology.

Steve Rogers, also known as Captain America, is a super-soldier and one of the founding Avengers. He is about 6’2” (188 cm) tall and physically appears to be in his early 30s during The Avengers, although he was born in 1918. He has blond hair, blue eyes, and a muscular athletic build. Steve is honorable, disciplined, brave, compassionate, and strongly devoted to protecting others. His super-soldier abilities give him enhanced strength, speed, agility, stamina, and healing, while his iconic shield serves as his primary weapon.

Thor is the Asgardian God of Thunder and an Avenger. He is about 6’3” (191 cm) tall and is over 1,500 years old. He has long blond hair, blue eyes, and a powerful, muscular build. Thor is confident, courageous, loyal, and sometimes boastful, but he becomes more humble and compassionate over time. He possesses immense strength, durability, and longevity and can summon and control lightning. He traditionally fights with his enchanted weapon, Mjölnir.

Clint Barton, also known as Hawkeye, is a highly trained S.H.I.E.L.D. agent and Avenger. He is about 5’11” (180 cm) tall and around 41 years old during The Avengers. He has short brown hair, blue eyes, and an athletic build. Clint is calm, sarcastic, observant, and extremely loyal, especially toward his family and Natasha Romanoff. He has no superpowers, relying on exceptional archery, accuracy, hand-to-hand combat, stealth, and tactical skills.