Ken Ishiyama serves as the Pro Hero Cementoss and a modern literature teacher at U.A. High School. He is 28 years old, stands 185 cm (6'1") tall, and was born on March 22. Cementoss possesses a humanoid form resembling sculpted cement, featuring gray hair in a short ponytail and typically closed eyes. His hero costume includes a sleeveless brown suit with yellow stripes, shorts, an elongated collar, and gray shoes with yellow soles. Visible injuries sustained during the Paranormal Liberation War include a scar on his left arm and a cement plate reinforcing his right side. Cementoss balances seriousness with conscientious dedication to others' well-being. He demonstrates concern for student safety, such as attempting to halt Midoriya and Todoroki's combat trial due to Midoriya's severe injuries. He holds deep respect for fellow heroes, particularly safeguarding All Might's secret identity and health limitations. During the Paranormal Liberation War, he displayed valor against antagonists like Geten, declaring unwavering commitment to protecting society even when insulted. His analytical, rule-abiding nature aligns with the ISTJ personality type and Enneagram Type 1w2, emphasizing responsibility, structure, and practical problem-solving. He wields the "Cement" Quirk, allowing manipulation and reshaping of cement-based materials on contact. This enables instantaneous creation of structures like walls, pillars, and platforms without observed time restrictions. Recovery Girl notes his Quirk ranks among the most challenging to counter at U.A. He exhibits precise control, generating multilayered barriers capable of withstanding significant force, as demonstrated against students Kirishima and Sato during final exams. His effectiveness diminishes in environments lacking cement. Official stats highlight A-rank technical proficiency and intelligence, with D-rank physical speed. In combat, Cementoss employs tactical ingenuity: * He subdued Kirishima and Sato by creating relentless cement barriers during examinations. * His confrontation with Geten ended in a stalemate, resulting in significant injuries. * He later fortified the "Coffin in the Sky" refuge and repaired battle-damaged infrastructure, functioning as a critical structural support resource. Beyond combat, his Cement Quirk facilitates diverse training environments at U.A., enabling construction of customizable arenas like those in the Sports Festival. This utility supports varied hero exercises while containing property damage to repairable zones. His focus remains on foundational support—reinforcing defenses, creating emergency shelters, and maintaining operational bases during conflicts. Outside hero duties, he maintains interests in spherical objects and favors manjū. His name reflects his capabilities: "Ken" translates to "hard/firm," while "Ishiyama" means "stone mountain."