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 Sako is a tall and slim man with brown eyes that are rarely seen. As the villain Mr. Compress, Atsuhiro's face is almost always covered by a mask and top hat.

Mr. Compress sports a red collared shirt with an azure bolo necktie and a black waistcoat. He also wears simple black pants that tuck into his white boots. Mr. Compress also has a golden overcoat that he wore during his first appearance and red gloves. Mr. Compress' signature items are his white mask and his brown top hat. His hat features a red band and a feather. He wears a balaclava and his mask changes it's black designs multiple times.

Giran gives Atsuhiro a prosthetic arm after Kai Chisaki destroys his original one.

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 taunting them. Mr. Compress also nearly lost possession of Katsuki after taking a moment to bow after his victory.

Mr. Compress is often the voice of reason among the League of Villains are appears to care for his comrades. He acts as a mentor to the younger members and often keeps them in check. After Magne's death, he immediately lept into action and tried to subdue Overhaul by himself. This action cost him his arm, but Compress was quick to get his revenge by destroying Kai's arm later on.

Abilities
Overall Abilities: Mr. Compress is a genius villain who thrives in a supporting role. He can act as the brains of an operation as well as act efficiently on his own. He single-handedly captured Katsuki Bakugo and completed the Vanguard Action Squad's mission.

Compress is a self-proclaimed master of deception, escapology, and illusion. He is clever enough to use his Quirk in creative ways and controlled enough to know the limits of his own power. Mr. Compress decided against fighting U.A. students and was almost fast enough to escape from them. Before getting caught, Mr. Compress was able to evade all of Shoto Todoroki's freezing attacks.

Compress is a master of stealth and often uses his Quirk on people before they ever knew he was around. He stole Katsuki and Fumikage before their classmates noticed and was only caught after he revealed himself. Mr. Compress is also a skilled tactician and uses his Quirk in creative ways to fool his opponents. He made the U.A. students believe they had rescued their friends by tricking them with compressed pieces of ice.

Enhanced Speed & Reflexes: Mr. Compress is incredibly mobile and agile. He easily outpaced pursuers in the forest by jumping across the tops of trees and even evaded Shoto's Giant Ice Wall move. He was also fast enough to catch Overhaul off guard.

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.

Forest Training Camp Arc

 * Bakugo Escort Squad vs. Vanguard Action Squad

Internship Arc

 * Kai Chisaki vs. League of Villains
 * League of Villains vs. Snatch

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