Sinon Asada is a skilled marksman and a main character in the anime series Sword Art Online. Known for her expertise in virtual reality gun games, she excels as a sniper in the Gun Gale Online game under the alias 'Sinon.' Her character is portrayed as cool and collected, yet she struggles with past traumas which she aims to overcome through her gaming persona. Sinon plays a pivotal role in assisting the protagonist, Kirito, during the 'Phantom Bullet' arc, helping him navigate and conquer the perilous world of Gun Gale Online.