Mugen is one of the main male protagonists of Samurai Champloo along with Jin. Both Mugen and Jin accompany Fuu in her search for "the samurai who smells of sunflowers." Mugen serves as a foil to Jin in terms of personality and disposition. His fighting style is characterized as being reckless and erratic.
Vote which fictional character would naturally fit in-universe with a big-named franchise! No time-travel, no interdimensional crap, no "Pooh's Adventures", they would just exist in-universe.
