The Great Sage of Small Sanctuaries
First appeared in Touhou 19: Unfinished Dream of All Living Ghost as a boss and playable character.
Hyped up as the reincarnation of the Monkey King, Son Goku by herself and Kicchou Yachie, Biten is a Sarugami who works for the Kiketsu Family as part of their operations to take over the surface world. In reality, as with Mitsugashira Enoko and Tenkajin Chiyari, she is a spy whose true allegiance lies with Nippaku Zanmu. She was tasked with sabotaging the Kiketsu Family's invasion plans from within by playing them for time as part of Zanmu's gambit to prevent a surface war. At the end, she decides to stay with the Kiketsu Family for real after feeling sorry for Yachie.
Person: red eyes, brown hair, medium hair, low twintails, monkey tail
Clothing: multicolored dress, sleeveless dress, single sleeve, single detached sleeve, white sleeves, barefoot, bare shoulders
Accessories: ruyi jingu bang, bangle or bracelet, circlet