Atsuhiro Sako, better known by his villain alias Mr. Compress, is a member of the League of Villains in the anime and manga series Boku no Hero Academia (My Hero Academia). He is known for his gentlemanly demeanor, clever wit, and his Quirk, 'Compress', which allows him to compress anything into a small marble. Mr. Compress plays a significant role as a strategist and support member in the League, often using his abilities for kidnappings and quick escapes.