Luis Guitterez was a pre-teen living in the Stone Perfs territory of L.A.. He rescued Hawkeye by calling for an ambulance when Hawkeye was shot by the Stone Perfs. The Perfs retaliated and shot Luis's mother. He decided that the Perfs needed to be dealt with and bought an assault weapon.
While Hawkeye tried to disrupt the Stone Perfs gang, Luis as the Terminizer would follow Hawkeye. When Hawkeye left, the Terminizer killed the captured gang members and spray painted a circle T as his personal brand. Hawkeye eventually figured out who the Terminizer was and confronted him. Hawkeye told him to go home to his mother, but did not turn Luis in to authorities.
Terminizer carries as assault rifle and a can of spray paint.