Chizome Akaguro, also known as Hero Killer: Stain, and formerly Stendhal, was a villain and former vigilante that was notorious for having killed many Pro Heroes. He is the main antagonist in the titular Vs. Hero Killer Arc. Stain is a cruel, unforgiving, and merciless man with a sense of duty to cleanse society of false heroes. He believes that those who become Heroes for fame or money are unworthy of being called the name. He took it upon himself to kill all unjust heroes!