The brothers Ibraim and Pedro Henrique de Oliveira a.k.a. "The Necro Brothers" began to show signs of psychopathy even before they began committing their crimes. Before the first homicide, there are reports from the time that the younger brother, Ibraim, used to kill animals and have sex with the carcasses. It is also worth noting that the brothers share a life story involving aggressions committed by their father during their childhood and adolescence, and that they were subjected to a toxic environment. They only learned to read and write and to "improve" their crimes even more after they joined the international supergroups of the ISG; before that, they were illiterate and poor. It is also proven that the group defeats and "is ahead" of any police force or military authority present today.