Stain

Chizome Akaguro, better known as Hero Killer: Stain and formerly the vigilante Stendhal. He is a villain and former vigilante that is notorious for killing many Pro Heroes that go against his ideology. After being heavily injured during his fight with the U.A students Izuku Midoriya, Shoto Todoroki and Tenya Iida, he was apprehended by the Pro heroes and sent to Tartarus prison. Despite this, his actions and ideals would heavily influence other villains such as Dabi, Himiko Toga, and Spinner, as they would join the League of Villains, led by Tomura Shigaraki to continue on his ideals. A few months later, following the Paranormal Liberation War, he managed to escape along with the other inmates after All For One let them all out. However, he chose not to join All For One's cause and went out on his own, resuming his duty as a "hero killer". Chizome is a very cold-hearted, methodical, and ruthless man. When he was in high school, he noticed how some students were applying to become heroes simply for income and fame. Disgusted by those ideals, he created an ideology of building a new world filled with true heroes. At first, he tried to spread word through communication, but when no one listened to him, his only other method was concentrated bloodshed, killing all the heroes he deems as "fakes". Better explanation, Stain targets the likes of anti-heroes. Despite his unforgiving nature, Stain has come to respect others. The most notable example is All Might, whom Stain believes to be not only a true hero, but the only real hero to exist in the world. His admiration for All Might runs so deep that he's the only one he's willing to let kill him. However, Stain has also shown respect to others who are strong and bravely willing to fight to save someone's life like Izuku Midoriya, to the extent his respect for Midoriya allowed him to spare his life.