Atsuhiro Sako hails from a lineage of thieves, tracing his roots to the infamous Peerless Thief, his great-great-grandfather, who was a legendary outlaw renowned for stealing from corrupt nobility. Inspired by his ancestor, Mr. Compress embraced the ideals of justice through theft, targeting those he deemed unjust while honing his skills as a master thief.

His decision to join the League of Villains was fueled by his disdain for the hero society, which he saw as perpetuating corruption and inequality. As one of the League’s older and more seasoned members, Mr. Compress often takes on a guiding role, providing wisdom and support to his comrades.

Mr. Compress is a tall man with a lean build. He wears a signature mask that covers the lower half of his face, along with a flamboyant costume that includes a long coat, a top hat, and gloves, reflecting his theatrical persona. When unmasked, he has short, wavy brown hair and sharp features that match his cunning demeanor.

Mr. Compress is suave, intelligent, and dramatic, often speaking with a flair that emphasizes his showmanship. He has a strong sense of loyalty to the League of Villains and a deep respect for his comrades, especially Shigaraki Tomura. Despite his villainous actions, Mr. Compress is guided by a personal sense of justice, targeting those he believes exploit or harm others.

Unlike some of his more chaotic peers, Mr. Compress maintains a level of composure and strategy in his actions, often serving as the voice of reason within the group. His theatrical nature and penchant for tricks add a unique charm to his character, making him both unpredictable and entertaining.

• League of Villains and Vanguard Action Squad
  As a member of the League’s Vanguard Action Squad, Mr. Compress plays a key role in the Forest Training Camp Arc, using his Quirk to capture Katsuki Bakugo and Fumikage Tokoyami. His ability to think on his feet and devise clever strategies makes him a valuable asset to the League.

• Paranormal Liberation Front
  Following the League’s merger with the Meta Liberation Army, Mr. Compress becomes one of the nine lieutenants of the Paranormal Liberation Front. His leadership and tactical prowess are evident during the Paranormal Liberation War Arc, where he risks his life to protect his comrades and Shigaraki’s vision.

• Final War Arc
  In the Final War Arc, Mr. Compress demonstrates his unwavering loyalty to the League, fighting to the very end despite overwhelming odds. His survival alongside Spinner marks him as one of the last remnants of the League of Villains, signifying his resilience and dedication to their cause.