Kirito, whose real name is Kazuto Kirigaya, is the main protagonist of Sword Art Online. He is a skilled solo player known for his calm demeanor, sharp reflexes, and exceptional swordsmanship in virtual reality worlds. Throughout the series, he becomes a central figure in fighting to survive deadly game systems, protecting friends and allies, and uncovering the mysteries behind the VR technology. He serves as both a hero and a symbol of determination, loyalty, and growth.