Sinon (シノン, Shinon?) is the deuteragonist of the Phantom Bullet Arc in the Sword Art Online (series), and is a skilled VRMMO game player in «Gun Gale Online» and «ALfheim Online». Her real name is Asada Shino (朝田 詩乃, Asada Shino?). She is nicknamed Hecate in GGO, after her gun «PGM Ultima Ratio Hecate II», a rare .50 caliber anti-materiel sniper rifle.
She is one of the main characters of the Phantom Bullet Arc and the first female player that Kirito met in GGO. She plays GGO to overcome her trauma concerning guns. After joining «ALfheim Online» she becomes a Cait Sith archer, where she is capable of hitting targets 200m away with a bow that should only shoot arrows accurately to a max distance of 100m. This bow was made by Lisbeth.