The main antagonist of "Battle Tendency" and one of the surviving Pillar Men, a race of humanoids revered as deities and demons in the New World that petrify while in sunlight and digest other lifeforms through physical contact due to their cells containing acidic enzymes and euphoria-inducing enzymes that keep the prey from realizing they are being eaten alive. Kars created the Stone Masks to prevent his race's extinction while evolve them into the Ultimate Being, ultimately forced to slaughter his people when they deemed his actions against nature. When Kars learn he needs a Super Aja to complete, he, Wamuu, and Esidisi traveled to Eursia and eventually entered a deep slumber in Rome before awaking in the 1930s to resume their search. Having fought ancient Hamon users, Kars develops his Light Mode where he produces saw-bladed appendages from his body. Kars ultimately acquires the stone and become the Ultimate Being, immune to sunlight with ability to produce Hamon and manipulate his body at a cellular level to manifest the traits of various creatures. But Kars's obsession of killing Joseph proved his downfall, being blasted out of Earth's orbit through a volcanic eruption and drifting into space.