A everyday friendly and lightful character, and even if it is not seen so much often, she is perhaps the most powerful and most fearful of all Samurai in the history of Japan. In similarity to her general Jubei is a highly skilled master of swordsmanship and is in position of a true spirit of the Samurai.
Jubei is throughout the series shown as a young red-haired girl with blue eyes, she usually has her hair fit into two ponytails, with a third one hanging over one of her shoulders and a slide set slightly above her forehead. She is most of the time dressed in a light red seifuku with a white skirt, black anklets, white tabi (toe socks) and shoes. When she transforms into a Master Samurai, she's still have her natural clothing as when she is in her normal state disregard the fact that she is armed with a set of daisho: a unusually decorated katana and a wakizashi, the traditional set of swords for a Samurai. In her transformed state, her regular blue eyes becomes yellow and shaped in the same style as a serpent and her voice lower and more serious. During her transformation into a Master Samurai she also loses her ponytails and her hair becomes a little shorter than before, beyond that she still looks like the normal innocent Jubei. She also has a power level of five million when she transforms according to Hattori and bears amber eyes with vertical slits, but in this state she has shown a sadistic side, yet she is an honorable warrior who gives respect to those who have earned it.
Unlike most of the other characters, Jubei is usually portrayed as a regular, happy fun-loving individual in her late teens who wants to be friends with everyone she mets. But in her true form as a all powerful Master Samurai she is quite different, with the contractual mark located on her chest. In her normal form though, she has no memories of her former life and has an obsession with Muneakira whom she refers to as "onii-chan" (big brother) due to the fact that they share the same surname. She is also airheaded and acts very much like a child, which is reinforced by the fact that she refers to herself in third-person. She possess no transformation phrase as she is shown only to transform only when she kisses Muneakira or when she bears feelings in an excessive extent.