Shigeo Kageyama, nicknamed "Mob" for his unassuming presence, is a middle school student harboring immense psychic abilities. His jet-black bowl-cut hair and typically blank expression conceal these powers, which erupt visibly when his emotions peak at 100%—triggering glowing red or white eyes and spiky floating hair that mirrors the overwhelming emotion dominating him. A childhood mugging incident where his uncontrolled powers injured his younger brother Ritsu compelled him to suppress his emotions, fostering a passive, socially anxious demeanor. This suppression hindered his ability to read social cues and form friendships. Despite this, he displays profound empathy and compassion, forgiving adversaries like Teruki Hanazawa and Minori Asagiri even after enduring six months of psychological torment in Mogami Keiji’s mental world. That ordeal diminished his naivety while deepening his appreciation for authentic bonds. Mob assists Arataka Reigen at Spirits and Such Consultation Office, exorcising spirits. He follows two principles: refusing to use psychic powers against people except in critical situations like rescuing Ritsu, and rejecting the notion that psychic abilities grant inherent superiority. This philosophy drives his commitment to self-improvement through ordinary means, such as joining the Body Improvement Club to build physical strength and social confidence. His dedication inspires peers, earning him the role of vice-president. His psychic powers encompass telekinesis, flight, energy barriers, absorption/transference, astral projection, chlorokinesis, and spiritual awareness. Emotional accumulation triggers distinct "100%" states—like Rage, Courage, or Compassion—each amplifying his abilities differently. When unconscious or severely compromised, he enters "???%," an uncontrollable state wielding near-limitless power without conscious direction. Key events include defeating Claw leader Toichiro Suzuki at 100% Resignation by contorting his body, then staying with Suzuki during self-destruction out of compassion. Later, he rejects Reigen’s exploitative demands, temporarily leaving to prioritize friendships and growth. After an accident awakens ???%, he reconciles with Reigen, who admits using him but affirms their mutual growth. Mob integrates his suppressed emotions, culminating in a rejected confession to his childhood crush Tsubomi and stabilized control over his powers and feelings. During Dimple’s Divine Tree plot to become a god, Mob resolves the conflict through trust instead of force. His journey concludes with fortified bonds—walking alongside Ritsu, Teruki, and Reigen—showcasing balanced emotional maturity and psychic mastery.