Ken Takagi, the Pro Hero Rock Lock, is a 32-year-old married man and father. His paternal role deeply shapes his perspective, fueling initial skepticism about U.A. High School students joining the perilous Shie Hassaikai raid; he sees them as inexperienced youths whose safety is paramount. Witnessing their actions firsthand, however, shifts his view, compelling him to acknowledge their capabilities and heroism, even noting they surpass the adult professionals in some respects. He possesses average height, dark tightly coily hair cut into a short afro, and pierced ears adorned with distinctive padlock earrings. Protrusions resembling key teeth extend from his fingertips. His hero costume consists of a yellow eye mask, a red necklace with dangling keys, and a yellow and dark green bodysuit featuring keyhole patterns, completed by white boots. Pragmatic and blunt, Rock Lock presents an initially critical demeanor, particularly towards those he perceives as inexperienced liabilities. He values competence and experience, detests patronization, and demonstrates loyalty and confidence in allies, though this confidence can verge on arrogance, as seen when he challenges Sir Nighteye's foresight. Underneath this stern exterior lies genuine concern for others' well-being, especially younger heroes, driven by strong protective paternal instincts. His views evolve based on observed actions, showing respect where earned. His Quirk, "Lock Down," immobilizes non-living objects or surfaces upon touch, fixing them relative to their surroundings. The effect can be overcome by sufficient force and has area limitations. His Ultimate Move, "Deadbolt," secures his immediate vicinity via a specific hand motion. He utilizes equipment like throwable tiles, locking them mid-air to create footholds. During the Shie Hassaikai raid, he participates in planning and scouting. He employs his Quirk to counter Mimic's environmental manipulation. Separated from the group, he is ambushed and stabbed by Himiko Toga, requiring hospitalization. Despite severe injuries, he urges colleagues to prioritize rescuing Eri and reflects positively on the students' courage. He later comforts his distraught wife during recovery. He attends the Hero Billboard Chart JP following All Might's retirement, commenting on Hawks' demeanor. He also joins operations against the League of Villains, including an undisclosed mission pursuing their transport vehicle where Dabi attacks his car. In the Paranormal Liberation War, he joins Endeavor's team raiding Jaku General Hospital to capture Dr. Kyudai Garaki. He battles Nomu, assists in restraining a High-End Nomu, and escapes Tomura Shigaraki's Decay wave by fleeing on Ryukyu's back. Later, he supports Shota Aizawa (Eraser Head), helping maintain Erasure on Tomura and providing first aid after Aizawa's leg amputation. He witnesses Izuku Midoriya using Float to save the group from decay. In the Final War, he assists in defending Central Hospital. He advocates trusting Lady Nagant to join the fight, citing her belief in Midoriya. He states he would take responsibility for her participation and provides her with a battle-tracking device.