Mezo Shoji operates under the hero name Tentacole, wielding a heteromorphic Quirk named Dupli-Arms. This power manifests as six tentacle-like appendages connected by a membrane, capable of transforming their tips into duplicated sensory organs—eyes, ears, or mouths—with heightened capabilities. These duplicated ears detect distant or obscured sounds, while the eyes grant wide-angle vision. Shoji typically communicates through these replicated mouths instead of his actual one. Hailing from a prejudiced rural village, Shoji endured severe discrimination for his heteromorphic appearance, branded a "monster" with "dirty blood" and suffering physical assaults that scarred his face permanently. A defining childhood moment saw him use his tentacles to save a drowning girl, creating his only positive Quirk memory. After his unmasked face frightened another child, he adopted his signature blue mask to prevent causing fear. Despite his imposing form, Shoji embodies gentleness, selflessness, and protectiveness. He harbors no resentment toward those frightened by him and consistently prioritizes others' safety over his own. His analytical mind rapidly deduces opponents' Quirk mechanics, and he lives minimally with few possessions. In combat, he utilizes Dupli-Arms for reconnaissance and defense—shielding allies, scouting areas, or creating diversions. His enhanced physical traits include crushing strength (540 kg grip force), speed sufficient to evade Dark Shadow, and durability to withstand dismemberment or energy blasts. At U.A. High, Shoji placed sixth in the Quirk Apprehension Test and tenth in midterm academics. During the U.S.J. invasion, he located classmates via sensory Quirk use and protected Tenya Ida from Kurogiri. In the Forest Training Camp, he rescued Izuku Midoriya from Dark Shadow's rampage, luring the entity toward Katsuki Bakugo and Shoto Todoroki for containment. He later embraced the hero name Tentacole, reflecting his limb-centric abilities. In the Joint Training Battle, Shoji countered Pony Tsunotori's speed until Mashirao Ojiro intervened. On Nabu Island (Heroes Rising), he shielded Mahoro and Katsuma Shimano from Nine's assaults, enduring laser injuries to ensure their escape. Confronting Spinner's heteromorph army in the Final War, Shoji deliberately revealed his scarred face while advocating against vengeful violence. He drew parallels between societal bias against heteromorphs and the manipulation of figures like Yuga Aoyama, urging unity over retaliation. His mask was torn during this clash, publicly exposing his scars. Eight years post-war, Shoji graduated U.A. and rose to the No. 9 Pro Hero rank. He received the Imamura Peace Prize, adopting a bulkier physique and a ponytail as symbols of his dedication to fostering a more inclusive hero society.