Sinon (Swimsuit version) of Sword Art Online

Sinon 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. 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.

Similar to both of her VRMMO game avatars, Shino has thin hair tied in small ribbons by the side of her face, with the back cut short. Unlike her avatars, Shino has dark hair in real life. She also wears a pair of half-rimmed glasses with oval-shaped lenses. Her skin is pale and she has black eyes. Her B-W-H measurements were 80-61-81 in the web novel.

Shino's avatar has thin, pale blue swaying hair that was casually short, but there was a tuft of hair tied up on both sides of her forehead, and indigo colored eyes. When she is in combat, her wardrobe is a desert colored military jacket, bulletproof armor and combat boots of the same color and she wears a white muffler around her neck.

When Shino was fewer than two years old, she was involved in a car accident. By the time anyone noticed the accident, it had been 6 hours. During the 6 hours, Shino's father slowly died from internal bleeding while her mother watched. Her mother was traumatized by the event and became very frail and was hurt easily. This resulted in Shino becoming overprotective of her mother. Nine years later, Shino was traumatized after she attempted to protect her mother during a robbery at a postal office, and ended up killing the robber with his own gun. As a result, she developed an intense fear of guns and a slight fear of men. She also was bullied up until high school for this reason. After being introduced into GGO, she fell into a trap, while navigating a dungeon alone, and faced an extremely powerful boss. By sniping it for countless hours from outside its attack range she received the PGM Ultima Ratio Hecate II sniper rifle. Her only reason for joining GGO is trying to relieve herself from her trauma with guns.

Calm and cool are two words that best describe Sinon's personality. In battle and most of the time in the game, she keeps a cool head that makes other female players admire her. However, Sinon has a violent temper once angered, best seen with her interactions with Kirito. It is actually said that Kirito is the first one to make her extremely angry. Despite all this, Sinon, while maybe hard to approach, is generally a friendly person and does not mind helping others.