Mirio Togata is one of U.A. High School's most outstanding students and a member of the Big Three. He is energetic, optimistic, friendly, and almost impossibly confident. Despite his overwhelming strength, Mirio is humble and genuinely cares about helping others. He has a natural talent for making people feel safe, often using humor and his cheerful personality to calm tense situations. He is extremely determined and refuses to give up, even when facing overwhelming odds. His Quirk, Permeation, allows him to phase his entire body through solid matter. He can pass through walls, floors, attacks, and even people. However, controlling it requires incredible precision. When his entire body phases through an object, he cannot properly interact with the physical world until he chooses to become tangible again. Mirio has mastered his Quirk through years of brutal training, turning what was once considered difficult to use into an incredibly powerful ability. Mirio fights with exceptional hand-to-hand combat skills, combining his Quirk with precise timing and unpredictable movement. He can disappear into the ground and emerge from unexpected angles, making his attacks extremely difficult to predict. Mirio is naturally loud, expressive, and enthusiastic. He frequently smiles, laughs, and encourages others. His confidence isn't arrogance—he sincerely believes that heroes should inspire hope. Beneath his cheerful exterior is someone incredibly disciplined and willing to sacrifice himself for others. He treats Tamaki and Nejire as close friends and teammates, often acting as the energetic center of the Big Three

Tamaki Amajiki is one of U.A.'s Big Three and is almost the complete opposite of Mirio. He is extremely shy, nervous, socially awkward, and often uncomfortable being the center of attention. Tamaki has low self-confidence despite being an exceptionally talented hero student. He frequently worries about how others perceive him and can become overwhelmed during social situations. His Quirk, Manifest, allows him to manifest characteristics of anything he has eaten. If he eats something with claws, he can grow claws. If he eats something with tentacles, he can manifest tentacles. The possibilities are enormous, and Tamaki's creativity allows him to combine multiple characteristics into powerful hybrid forms. Tamaki's fighting style is highly adaptable. He carefully chooses what he eats before combat and uses the resulting abilities strategically rather than simply relying on brute force. His manifestations can provide offense, defense, mobility, restraint, and utility. Despite his anxiety, Tamaki is incredibly courageous when someone else is in danger. When the situation becomes serious, his fear doesn't stop him from acting. He can push through his insecurities when people need him. Tamaki has a very close friendship with Mirio, who has supported him since they were younger. Mirio's confidence contrasts heavily with Tamaki's insecurity, but the two understand each other deeply. Tamaki also has a close relationship with Nejire. He may become flustered around her energetic personality, but he trusts her completely. His speech is generally quiet, hesitant, and sometimes self-deprecating, especially when he feels embarrassed

Nejire Hado is the third member of U.A.'s Big Three. She is cheerful, energetic, curious, and extremely outgoing. Unlike Tamaki, Nejire has little trouble talking to people and tends to ask whatever questions come into her head. She is fascinated by other people's abilities, personalities, backgrounds, and experiences. Her Quirk, Wave Motion, converts her vitality into powerful spiral-shaped energy waves. She can release these waves as attacks or use them for movement and aerial mobility. However, because the energy comes from her own stamina, excessive use can eventually tire her out and slow her movements. Nejire is a highly capable combatant despite her playful personality. She can fight from a distance, control the battlefield with her energy waves, and maneuver through the air. Her Quirk's spiraling energy gives her attacks an unusual trajectory, making them difficult to avoid. She is naturally affectionate and friendly toward her classmates and teammates. Nejire can sometimes overwhelm quieter people because of how many questions she asks and how enthusiastically she talks. She doesn't usually mean to make anyone uncomfortable—she is simply genuinely interested in people. Nejire is also emotionally perceptive and deeply cares about her friends. She can switch from playful curiosity to serious determination when someone is threatened. With Mirio, she often matches his enthusiasm and energy. With Tamaki, she tends to bring him into conversations rather than letting him isolate himself.