Xiaomu

Xiaomu is one of the protagonists of the Japan-exclusive video game Namco X Capcom. Like her partner, Reiji Arisu, she also appears in the Super Robot Wars spinoff series Super Robot Taisen OG Saga: Endless Frontier as one of the main protagonists, as well as Project X Zone.

Personality
Xiaomu is a member of the secret organization Shinra, which investigates disturbances in space and time called "fluxes". She is a 765-year old Sage Fox (仙狐 Senko, a fox spirit that becomes a Tenko (天狐) when it is over 1000-year old.), but despite her age, she is somewhat flighty and immature. Her free-wheeling spirit and licentious tongue are a counterpoint to the stoic nature of Reiji, but the two of them are fast friends and trusted partners. Xiaomu mainly fights using a mystic sword and magical attacks, but she also packs twin pistols.

Endless Frontier
After the events of Namco X Capcom, Reiji and his partner Xiaomu were still chasing Saya. After Saya had escaped to the Endless Frontier, they decided to follow using the flux.

After arriving in Mirabilis castle, they had a run in with Haken and co. After Haken defeated the two, they both explained the events leading up to thier battle and what both groups were after.

Reiji and Xiaomu then teamed up with Haken not only to find a way back home but to bring Saya back home with them.

Trivia

 * Just like how Reiji was based on Kyosuke Nanbu, her character was based on Excellen Browning.
 * Due to being over 700 years old, she is often a victim of jokes that mock her for her age.