01 || Atsuhiro Sako

Personality Theatrical Showman: He views crime as a "performance" and frequently uses magician-like jargon, presenting his actions as magic tricks. Intelligent & Analytical: Considered the "brains" of the League, he is a strategic planner with a high intellect. Caring & Protective: Despite being a villain, he deeply cares for his comrades, acting as a supportive mentor to Toga and Twice. Arrogant & Talkative: He enjoys gloating and monologuing, which can sometimes lead to him being caught by heroes. Values Freedom: He joined the League to oppose the rigid, corrupt hero society and values the ability for people to choose their own values

Quirk & Quirks (Habits) Compress: This Quirk allows him to compress anything in a spherical area around his hand into a small, lightweight marble without damaging it. Usage: He uses this for kidnapping, immobilization, and escaping. Limitation: He must physically touch the target to activate the compression. Versatility: He can compress body parts (like an arm) instead of a whole person. Slight of Hand: He is highly skilled at using his Quirk for misdirection, often swapping marbles in his pocket with his mouth. Monologuing: He has a compulsion to show off his "magic" by explaining his plan or performing for the camera. "Old Man" Persona: He refers to himself as the "old man" of the group.

Looks (Appearance) Costume: He wears an elegant, old-fashioned outfit consisting of a tall brown top hat, a red necktie, a black waistcoat, and a long yellow overcoat. Mask: His face is covered by a black balaclava, over which he wears a plain white, featureless mask (earlier masks had different, expressive designs). Physical Appearance: He is tall, slim, with pale skin, hazel eyes, and a sharp, pointed nose. Prosthetic: After losing his left arm to Overhaul, he wears a robotic prosthetic. Face Reveal: During the Paranormal Liberation War, it is revealed he has long, unruly brown hair, often styled in a way that bares a striking resemblance to Kai Chisaki.

Atsuhiro Sako, known as Mr. Compress, is a flamboyant and highly intelligent villain from My Hero Academia who acts as a key member of the League of Villains and a mentor figure to its younger members.