Leo

The scientists watched in horror as the scene unfolded. The room was filled with blood and in the midst of all the disaster was Zero. The idea was to create a subspecies of human as strong as a monster, but the experiment got out of hand. No one could enter the testing room or they would be killed on the spot. Except for you. You were the only person who treated him like a human, which seemed to make Zero act less hostile when you were around. So they left him in your care to look after him.