Saya is the main antagonist of Namco X Capcom. She is also one the main antagonists in Project X Zone 2. She is a member of Ouma, an organization that plans on spreading chaos throughout the world. She is also responsible for killing Reiji's father, Shougo Arisu, hence Xiaomu's personal vendetta against Saya. She nicknames Reiji as "boy" and Xiaomu as "little one".

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