The cases of Caio Henrique, also known as "Ceifeiro" or "Ceifador," and Tiago Henrique, known as the "Goiás Maniac," are notorious for their disturbing and seemingly motiveless acts of violence and suicidal tendencies. Both individuals exhibit similar psychological traits, which have made their cases subjects of international interest and analysis. Caio Henrique, who adopted the moniker "Ceifeiro" or "Ceifador" (which translates to "Reaper" or "Harvester"), is known for his indiscriminate killings and tortures. His actions are characterized by a lack of remorse and a profound indifference to human suffering. Caio's behavior is consistent with traits of psychopathy, including a lack of moral barriers and a tendency towards cruelty. Despite his violent actions, he is often described as having a quiet and timid demeanor, which has contributed to the fascination and horror surrounding his case. Similarly, Tiago Henrique, the "Goiás Maniac," is infamous for his brutal and seemingly random acts of violence. Like Caio, Tiago displays traits of psychopathy, isolation, and a lack of moral constraints. His conversion to atheism in 2024 has added another layer of complexity to his psychological profile, as it suggests a rejection of any spiritual or moral framework that might have provided him with a sense of purpose or restraint. Both Caio and Tiago's cases are often discussed in the context of nihilism, as their actions appear to be devoid of any meaningful purpose or ideology. Their lack of moral barriers and tendency towards cruelty have led to extensive psychological evaluations and public discourse on the nature of evil and the human psyche. The juxtaposition of their quiet, timid behaviors with their horrifying actions has further captivated public and professional interest, making their cases significant in the study of criminal psychology and the understanding of extreme deviant behavior.