Kars

Kars (known as Cars in Japan) is one of the ancient Pillar Men, a vampire-like race native to Mexico. Kars led the Pillar Men during chapters 161-203 in their attempts to rule the world.

Relationship with the Pillar Men
Around 2 CE, Kars and the Pillar Men lived peacefully. Kars thought peace was for losers, and being the Chad he is, wanted to bring glory to his race and eliminate all others. He created the Stone Mask, which if touched by blood shoots out spikes that transform one's physiology. This would make them have to hunt a lot more humans to survive, but would give them immense power. He became vastly stronger than any of his brethren. However, only one of them joined him, his wife Esidisi. The others were brutally slaughtered as they tried to stop Kars.

Kars and Esidisi spared three babies, Whammu, Santana, and Ricardo Milos. However, he still wanted three of his own. Esidisi revealed that he was in fact a man, and not a woman, and thus could not bear children. Kars, furious, sailed to Rome with his family, leaving Santana behind in Mexico, to get divorced. They went on a destructive rampage afterwards, before being stopped by Jesus, who sealed them beneath Rome. Ricardo got separated and fell in the Mediterranean, where he slept for almost 2000 years.

Defeat
After being awakened by Ricardo, Kars took his family and set about to conquer the world. His conquest was short-lived however, as in chapter 203, after Kars' family was long dead, Albus Dumbledore used his Chaos Bazooka attack to decimate Kars. However, the chaotic nature of the spell blasted Kars' bits to Mars.

36 Kars's on Mars
The atmosphere on Mars caused Kars to regenerate incorrectly, forming 36 versions of himself (each at about 90% of his original power). They were all just as cunning though, and formulated a plot. In chapter 207, the Kars's announced their Universe-Wide Martial Arts Tournament, in which the strongest in the universe would compete for glory. The 36 Kars's exploited the mortals' hubris, and intended to absorb them.

The tournament was going well, until William Howard Taft arrived. Taft attempted to sneak around, but the sound of his butt cheeks clapping alerted the Kars's, who swooped in to stop him. Taft had no choice but to vore himself, eliminating all 36 versions of Kars.