1. Griffith from ‘Berserk’
To join the God Hand and become Femto, he sacrificed the majority of the Band of the Hawk. The only survivors of the incident, Guts and Casca, were then tortured and humiliated by him. Guts was betrayed, and he vowed to murder Griffith as retaliation. His betrayal caused Casca to go catatonic and become a shell of the person she once was.