Atsuhiro Sako, also known as Mr. Compress, is a recurring villain affiliated with the League of Villains, was a member of the organization's Vanguard Action Squad, and later became one of the nine lieutenants of the Paranormal Liberation Front. He followed in the footsteps of the Peerless Thief, who was his great great grandfather and became a nationwide wanted thief, being one of the more 'experienced' members of the League.