Ectoplasm.

Abilities: Ectoplasm exhales a specialized, billowy substance from his mouth that solidifies into autonomous clones of himself, including his clothing and prosthetics. Capacity: He can create and control up to 30 clones simultaneously, though he has demonstrated the ability to create more, such as 36 on a "good day". Combat Style: He utilizes these clones for swarm tactics, overwhelming opponents with rapid-fire kicks. Weaknesses: Clones can be destroyed by heavy, concentrated damage, often making them vulnerable to Area of Effect (AOE) attacks. Role and Abilities Teacher: He teaches mathematics at U.A. High School. Combat Instructor: He uses his cloning ability to create challenging, multi-opponent training scenarios for students, such as in the First Term Final Exam against Fumikage Tokoyami and Tsuyu Asui. Pro Hero: Known for his role in defending U.A. during the U.S.J. incident and providing security for the school festival. Appearance: He wears a distinct trench coat and a black helmet with a shiny faceplate, concealing his face. Key Facts Prosthetics: He lost his legs to a villain but uses, high-speed combat-optimized prosthetics for fighting. Personality: Unrelenting and stern, he is dedicated to fostering strength in his students through intense pressure. Intelligence: He is highly intelligent, using his knowledge to analyze and exploit weaknesses in opponents' quirks.