Saya is the main antagonist of Namco X Capcom and a major antagonist in Project X Zone until she joins the players in one of the later chapters and becomes a Anti-Protagonist. She is a rival of the Shinra organization. Saya also appears as an enemy in Super Robot Taisen OG Saga: Endless Frontier and as support character in Super Robot Taisen OG Saga: Endless Frontier EXCEED, where she can team up with her rivals Reiji Arisu and Xiaomu.
10 years prior to Namco x Capcom's events, she fought against Shogo Arisu and even scarred young Reiji in the head before being sealed away. Years pass, and she reappears again in front of Reiji and Xiaomu again. After sending their friends away in Roppongi, Reiji managed to break the Dimensional Seal and managed to aim her gun at her head. Though he misses his chance, Reiji and Xiaomu were the last ones to disappear.
She conspired with different orginazations and enemies, all for one purpose: the revival of the Ouma Project, 99.
She also appears constantly against the heroes, even taking the time to occasionally flirt with Reiji, which annoys him. Near the end, the worlds merged and 99 was finally revived. Eventually, Reiji finally stood against her and destroyed the ancient armor. She then allowed Reiji to take the last shot to her head.
Namco x Capcom
Saya teams up with several villains like M. Bison and the Grandmaster.
Super Robot Taisen OG Saga: Endless Frontier
Saya somehow survived the events from Namco × Capcom, and she was sucked into a flux while being pursued by Reiji and Xiaomu. Being stranded on an unfamiliar world hasn't stopped her scheming ways, however, and she uses every trick up her sleeves to get what she wants.
Project X Zone
Saya makes an appearance in Project X Zone. She is an initial boss and is later a support character for any of the playable characters. She also makes an appearance in Project X Zone 2 as the tetiary antagonist and is a boss unit along with Sheath, who is an agent of the North American branch of Ouma.
An agent of "Ouma." an organization that opposes Shinra and seeks to bring chaos to the world. A central figure in many of Ouma's plans, she has been active in many different places. Her true identity is an extremely old werefox, a mystical creature with the ability to disguise herself as a human. She fights with three swords called "Homura," "Kouri," and "Kusabi" respectively, a grenade launcher called "Kurotsuchi" and short sword coated in poison called "Shinogi." She is also skill in the mystical arts of the werefox. She has a very laid-back personality and takes things at her own pace, ofter interacting with others in a contemptuously nonchalant way. She also apparently has a long history with the Arisu family.