Atsuhiro Sako

Atsuhiro Sako, also known as Mr. Compress (コンプレス), is a villain affiliated with the League of Villains and a member of the organization's Vanguard Action Squad. He is known for being one of the smartest villains in the world and acts as the brains of the League of Villains. He and the rest of his team serve as the main antagonists of the Forest Training Camp Arc.

Appearance
Atsuhiro is a tall and slender man with brown eyes. As Mr. Compress, he wears gloves, an azure bolo necktie, a large golden overcoat, boots, and a top hat with a red band attached to a feather. Under his coat, Atsuhiro wears a red shirt and a black waistcoat. Following the events of the Internship Arc, he acquired a robotic prosthetic arm.

Mr. Compress' face is covered by a balaclava and a white mask with black motifs. He changes the appearance of his mask at the turn of every story arc.

In the Forest Training Camp Arc, the mask bears large, stylized eyes and teeth, exhibiting what appears to be a grin.

In the Hideout Raid Arc, the top half of the mask is painted with parallel vertical lines, while the lower half has diagonal lines that meet along the vertical axis of the mask.

At the end of the Hero License Exam Arc and at the start of the Internship Arc, the mask Mr. Compress wears sports a black dot at the center of the upper half, while the lower half bears oblique lines that seem to converge towards it.

During the Internship Arc, he dons two more masks: one which bears resemblance to a frown, and a plain one with a black dot where each of Mr. Compress's eyes would be.

Personality
Atsuhiro is a showman at heart who likes to command every event he's a part of and be as flashy and entertaining as possible. He is talkative, humorous and arrogant with his allies and enemies alike.

Mr. Compress has a habit of monologuing and showing off his entertainer skills. This has proven to be a flaw in Atsuhiro's skills as a villain. He allowed the Bakugo Escort Squad to catch him because he spent so much time monologuing. Mr. Compress also nearly lost possession of Katsuki after taking a moment to bow after his victory.

He has a vengeful side as he wasted no time in compressing half of Kai Chisaki's arm after the latter had destroyed his arm.

Abilities
Enhanced Speed & Reflexes: Mr. Compress is endowed with quick reflexes and impressive acrobatic skills. He was able to dodge Shoto's ice, even when the latter uses his Giant Ice Wall, with little effort, despite being on top of a tree. He is also very fast, quickly distancing himself from the U.A. students by running on the treetops.

Genius-Level Intellect: Mr. Compress considers himself an expert in deception and illusion. True to his words, he was able to restrain Katsuki and Fumikage without their comrades noticing, and he was spotted only when he decided to make his presence known. He also tricked his pursuers into thinking the marbles in his pockets were those of the two boys, while those were actually dummies he had prepared while dodging Todoroki's attack.

Stealth: Mr. Compress was able to activate his Quirk, requiring physical contact, on Katsuki and Fumikage while they were in a group of five people, among which was Mezou, whose Quirk grants him enhanced senses, demonstrating excellent stealth abilities. Likewise, he incapacitated Snatch by circling around and touching him while the latter was fighting Dabi. Compressing himself allows him to be carried anywhere without being detected.

Quirk
Compress (コンプレス): Mr. Compress's Quirk allows him to "compress" anything in a spherical area into a small marble without actually damaging it. The weight of the target is reduced alongside them, making them very easy to carry. If used on a person, it effectively entraps them, terminating the fight instantly and allowing Mr. Compress to abduct them without difficulty. The Quirk can also be used on select body parts, maiming the target.

Equipment and Weapons
Prosthesis : Since his first meeting with Chisaki, Mr. Compress has lost his left arm by being disassembled by Chisaki's quirk, replacing it with a prosthetic arm. However, he cannot use his quirk with his prosthetic arm.

Forest Training Camp Arc

 * Bakugo Escort Squad vs. Vanguard Action Squad

Internship Arc

 * Kai Chisaki vs. League of Villains: Indecisive
 * League of Villains vs. Snatch: Win

Tomura Shigaraki
Mr. Compress appears to have a sense of loyalty to Tomura similar to Kurogiri. His actions and instructions during the battle between All Might and All For One were thought out for Tomura's interest.

After his teammates escaped, Mr. Compress was seen alongside with Tomura while the other members were separated elsewhere.

League of Villains
Mr. Compress seems to genuinely care for his teammates. He does not view his teammates as merely hoodlums who commit acts out of just evil purposes. Rather, he seems to understand their circumstances and can relate to their situations.

During the battle between All Might and All For One, he took charge of the situation for the best interests of his teammates: instructing appropriate actions for Tomura and compressing Dabi in order to carry him to safety.

After the battle, he made sure that the members regularly contacted one another to make sure none of them are caught and puts them in danger.

Trivia

 * In one panel of Chapter 156, the chin portion of Mr. Compress's mask is painted black, whereas in all other cases it is white.
 * He is a B-Rank Villain.

Quotes

 * (To several U.A. students) "We're just a bit fanatical when it comes to our values. All we wish is to show him that there are other ways. Because you kids today... you have your values chosen for you."

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Atsuhiro Sako