The supervillain you are referring to is Two-Face, also known as Harvey Dent. Once a noble and righteous district attorney of Gotham City, he was scarred in an accident, triggering a mental imbalance. Two-Face embraces chance and duality, deciding his actions through the flip of his "lucky" coin. This enigmatic character serves as a dark reflection of the inner conflicts within the human psyche. Batman, also known as Bruce Wayne, tirelessly battles against Two-Face and other villains to maintain peace and justice in Gotham City.