Kars is the main antagonist of Part 2, Battle Tendency. Kars is the leader of the Pillar Men, and the designer of the Stone Mask. His goal is to evolve further to become immune to the sun’s rays, and thus he seeks the Red Stone of Aja to empower his Masks, battling the Hamon users for its possession. He is ranked 1st out of all the Pillar Men.

As the creator of the Stone Masks and Vampires, Kars is one of the more influential characters in the series, his invention having far-reaching repercussions for a number of major characters, such as Dio Brando, the Joestar Family and the Zeppeli Family.