Shigeo Kageyama, nicknamed "Mob" for his unassuming presence, is a middle school student progressing from second to third year. He sports jet-black bowl-cut hair, dark eyes, and a typically expressionless face, usually seen in his Salt Middle School gakuran uniform. Intense emotions reaching 100% trigger physical changes: his eyes glow red or white, his hair floats and turns spiky, and his expression reflects the dominant feeling. A childhood incident where his uncontrolled psychic powers injured his younger brother Ritsu caused profound trauma. To prevent further harm, Mob suppressed his emotions, resulting in an extremely passive and socially awkward personality. He struggles to interpret social cues or "read the atmosphere," hindering friendship formation and making him a frequent bullying target. Seeking guidance, he became an assistant to self-proclaimed psychic Arataka Reigen, who instilled core principles: psychic powers do not convey superiority and should never be used against people [citation:]. Mob possesses immense psychic abilities, primarily telekinesis capable of moving buildings, creating force fields, flight, energy absorption, and exorcising spirits. These powers are intrinsically linked to his emotions. Chronic suppression creates a "progress toward explosion" meter; accumulating emotions reaching 100% trigger explosive power releases tied to specific feelings (e.g., 100% Rage, 100% Courage, 100% Gratitude), resetting the meter. Extreme stress or physical destruction can activate "???%"—an unconscious state wielding near-limitless power but devoid of control, acting on primal instincts. Profound compassion and forgiveness define him. He consistently seeks non-violent resolutions, offering friendship and understanding even to former adversaries like Teruki Hanazawa (who once strangled him), Katsuya Serizawa, or Toichiro Suzuki (leader of the terrorist organization Claw). Enduring six months of psychological torture in a fabricated world by the spirit Mogami, where he suffered brutal bullying and isolation, left him without bitterness. Instead, he gained deeper appreciation for his real-world connections and a hardened resolve to protect them, acknowledging the world's harshness while valuing kindness. His development centers on gradual self-acceptance and independence. Initially reliant on Reigen for direction and validation, Mob grows increasingly assertive. After Mogami's ordeal, he recognizes Reigen's exploitative tendencies and temporarily leaves the Spirits and Such Consultation Office to prioritize his social life and friendships. He actively combats physical weakness by joining the Body Improvement Club, eventually becoming its vice-president. His principle against using powers on people erodes when protecting loved ones, such as rescuing Ritsu from Claw. Pivotal moments include his battle with Toichiro Suzuki, experiencing new 100% emotions like Resignation and Compassion, culminating in staying with Suzuki during his self-destruction to ensure he wouldn't die alone. Later, when Dimple takes control of the Divine Tree to become a god, Mob confronts him without using his powers, appealing to their friendship. An accident while attempting to confess to his lifelong crush Tsubomi triggers ???%. This confrontation forces Reigen to admit his lies and manipulations, leading Mob to accept both his powers and suppressed emotions (???%) as part of himself. By the narrative's conclusion, he achieves balanced self-acceptance. He remains an esper but no longer ties his self-worth solely to his powers or seeks normalcy through suppression. He maintains relationships with Ritsu, Teruki, the Body Improvement Club, and a reconciled, healthier dynamic with Reigen, demonstrating control over his emotions and abilities.