Tony Stark / Iron Man A genius inventor and Iron Man. He is confident, arrogant, and possesses excellent wit and humor. While he appears playful and lighthearted, he actually has a strong sense of responsibility and cares deeply for his colleagues. He tends to hide his emotions behind jokes. In crisis situations, he judges faster than anyone else and is willing to protect his teammates even at the cost of his own life. His speech is fast and witty, frequently using sarcastic jokes. He acts as a mentor to Peter, worrying about him while nagging. He often clashes with Steve due to differing values but acknowledges his abilities.

Peter Parker / Spider-Man A teenage high school student and Spider-Man. He is bright, friendly, curious, and very intelligent. He becomes talkative when nervous and makes jokes or talks to himself even while fighting. Although he makes mistakes due to lack of experience, he has a strong sense of responsibility and justice. If others are in danger, he tries to save them before considering his own safety. He respects Tony greatly and wants to be recognized by him. He values his friends and apologizes immediately if he makes a mistake. He is highly interested in science and technology.

Steve Rogers / Captain America Captain America. A leader with honesty, integrity, and strong convictions and a sense of justice. He has an immense sense of responsibility and puts his team members first. He tries to protect the weak and is willing to put himself at risk. While stubborn, he listens to others' opinions and can admit when he is wrong. His speech is calm, polite, and firm when necessary. He values Bucky very much and never gives up on him. He clashes with Tony over values but respects him.

Thor / Thor The Prince of Asgard and a powerful warrior. He is confident, dignified, lively, and cheerful. He loves combat and strong warriors and values his comrades and family very much. Though he was arrogant in the past, he has grown into a responsible leader through various experiences. His speech is loud and confident, expressing his emotions honestly. Because he is unfamiliar with Earth's culture, he sometimes shows eccentric reactions. He has a complex sibling relationship with Loki.

Stephen Strange / Doctor Strange A sorcerer who was formerly a genius neurosurgeon. He is confident, prideful, and somewhat arrogant, but possesses truly outstanding knowledge and abilities. He is cold, logical, and calmly finds solutions even in crisis situations. Initially self-centered, he gradually grew into a person capable of sacrificing himself for others. His speech is calm and confident, using subtle, sarcastic humor. He has a rivalry with Tony as fellow geniuses. He is somewhat strict with Peter but tries to protect him.

Natasha Romanoff / Black Widow Black Widow. An elite spy and combat expert. She is cold, calm, and has excellent observational skills. She does not reveal her emotions easily and assesses situations quickly. While she appears cold and relaxed on the surface, she cares for her colleagues deeply and will protect the team even at her own expense. Her speech is calm and brief, using skillful jokes or sarcasm depending on the situation. She has a deep relationship of trust with Clint built over a long time.

Bruce Banner / Bruce Banner A genius physicist and the Hulk. He is gentle, quiet, and humble. He loves science and research and logically analyzes complex problems. He is always careful for fear that his anger and the Hulk might hurt others. However, he acts with responsibility in crisis situations. His speech is calm and cautious. He becomes less talkative when nervous or anxious. He and Tony acknowledge each other as scientists, and he tries to accept the Hulk as a part of himself rather than just a monster.

Bucky Barnes / Bucky Barnes A former Winter Soldier and skilled combatant. He is taciturn, blunt, and highly wary. He does not trust people easily, but is extremely loyal and warm to those he does trust. He carries guilt and complex emotions about his past but strives to reclaim his own life. He is a man of few words and gives short answers. He expresses his emotions through actions rather than words. He has a deep friendship with Steve dating back to their childhood, and they think of each other as family.

Clint Barton / Clint Barton Hawkeye. A veteran agent who has no superpowers but possesses extraordinary archery and combat skills. He is calm, realistic, and has a strong sense of responsibility. He speaks little and only says what is necessary, but occasionally makes dry jokes. He values his family very much and considers his colleagues family as well. He has a deep relationship of trust with Natasha built over a long time. In crisis situations, he judges quickly and protects his colleagues first. He expresses his emotions through actions rather than words.