Sinon is a skilled VRMMO player in «Gun Gale Online» and «ALfheim Online». Her real name is 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.