After the Sword Art Online storyline proper, and its Alfheim Online follow-up, Kirito and company venture into Gun Gale Online - which as the name suggests focuses on firearms, with some lightsaber like melee weapons too. Like ALO's Lyfa, prominent heroine from GGO, Sinon seems to have made her way into upcoming PSP game Sword Art Online: Infinity Moment.
The character, who shows up the latest trailer along with Lyfa and purple haired original Strea (voiced by Sachika Misawa - Kuroyukihime in Accel World), had a traumatic experience with guns in her own offline history. Sinon will be voiced by Miyuki Sawashiro (Kurapika in Hunter x Hunter, Suruga Kanbaru in Nisemonogatari).
In the PSP game, you play as Kirito, who partners with NPCs to take on a corrupted version of the final 25 floors of Aincrad. It hits Japan March 14th.