The reincarnation of the legendary swordman Jugei Jagyu Mitsuyoshi
Jubei Yagyuu, who is created by Akira Suzuki, has no information regarding any inspiration used to create her. She first appears in Hyakka Ryouran Samurai Girls Light Novel volume 1 and episode 1. She's voiced by Aoi Yuki.
She has two different personalities, or more accurate two different person in a same body. She is first seen in her weak and personality, with blue eyes. When she kiss Muneakira, she switches personality into the strong and sadistic one, with the physical transformation her eyes changed color into amber. Her strong personality has a very big power. When she transform, Muneakira is bound with a chain.
The weak calls Muneakira with "Oni-chan." The weak is very innocent, and a little bit airhead. She doesn't have any memories.
When her strong personality appears (after a kiss), the weak personality is gone, so the body just can contain one personality. Usually, after the strong personality disappears, the weak personality will be back. But, when the strong and weak personalities meet, the strong tells the weak that she's the real "Jubei Yagyu", and the weak is just a personality created by an incomplete contract. if she kiss Muneakira again, the kiss will complete the contract, which make she can't switches to the weak anymore. In other words, the weak will be gone forever. But because it's very necessary, the weak kisses Muneakira, with tears on her face. She then fights the samurai with white aura, but she loses. The two personality then combined into a person, that makes her can defeat the white samurai, with her life in exchange.
In her strong personality, Jubei's weapon is a set of Daisho. Her aura is black, like other samurai. Her contract's tattoo is on her chest.