Caio Henrique is a Brazilian spree killer, mass murderer, serial killer, and self-styled vigilante mastermind. Known for his extreme violence, sadistic torture methods, and erratic personal habits, Henrique is regarded as one of the most prolific and feared human killers within modern criminal history and, in some accounts, as an associate figure orbiting the Immortal Slasher Group (ISG) mythos. Henrique’s crimes blur the boundaries between serial killing, spree killing, and mass murder, as he often shifted between methods depending on opportunity and circumstance. Investigators attribute dozens (potentially hundreds) of deaths to him (surpassing 300), though his true body count remains unconfirmed.