Karlos José or KJ is a Brazilian-American genocidal mass murderer, terrorist, vigilante and former hitman who, along with fellow Brazilians Caio Henrique/CH and Teixeira/TX, gained notoriety for their brutal and prolific mass murders, terrorist attacks and genocides. They made world history: three "humans" who were directly responsible for the deaths of millions. KJ and TX use brute and physical force, often killing the enemy with just one punch, and blowing his head off. Caio has access to a large arsenal of bladed weapons, firearms, etc., and is proficient in torture and dismemberment. Together, they are leaders of several shadowy and violent international groups that take justice into their own hands. KJ is supposedly "bulletproof", Teixeira has "reflexes to evade gunfire" and Caio seeks not only to kill a specific victim, but the rest of her family tree, thus intimidating authorities and police from confronting them.