|Profession||Vagabond, Pirate (former)|
|Weapon(s)||Double-edged Tsurugi with two-prong hilt, Tantō (concealed in opposite end of scabbard)|
|Fight Style(s)||Champloo/Champuru Kendo and Martial Arts|
|Likes and Dislikes|
|Likes||Food, Booze, Pretty women, Fighting, and Killing|
|Behind the Scenes|
|First Appeared||Tempestuous Temperaments|
During the title cards, his totem is the rooster.
Mugen has messy brown-black hair in an afro-like style (similar to Spike Spiegel's from Cowboy Bebop) and a faint beard. His clothing is anachronistic as well, reminiscent of baggy hip-hop fashions of today. His attire consists of a grey shirt with a stitch pattern running down the middle ending halfway down. He wears this under a red long-sleeve gi that functions as a jacket. He wears hakama cut off at shorts-length, resembling loose-fitting Bermuda shorts and japanese Geta (wooden sandals) on his feet. These geta are fitted with several metal strips on the soles, allowing him to use his sandals as blocking devices. He has two blue ring tatoos, two on each wrist and one just above each ankle and matching ball earrings. Lastly, he carries his sword on his back with a sash that goes from his left shoulder to his right hip. It has a zig-zag pattern of green and brown.
Rude, lewd, vulgar, and nihilistic, Mugen is something of an antihero. He is fond of fighting and has a tendency to pick fights for petty reasons. In several episodes it is made clear that Mugen is a womanizer, and his libido often gets the better of him. Character designer Kazuto Nakazawa stated in an interview: "When I was doing character design, the most difficult one was Mugen, as I expected. I'm pretty sure that as far as the director's image went, he probably was thinking of someone like a 'rapper who acts like a bad guy.' But the way Mugen acts is relatively based on his core conviction."
Mugen was born in a penal colony on the Ryukyu Islands, which in the Edo period was a separate kingdom with close ties to the Satsuma domain of Japan. (Most likely Miyako Island since it was a penal colony in the past and the ghostly people that appear to Mugen during his near death experience in Episode 14 conspicuously resemble Miyako's Paantu.) His name means without limitation, as the components of it are the characters for "without" and "limitation." Incidentally, he writes his name using the infinity symbol (∞), a pun on his name, 'Mugen,' which is a homophone of the Japanese word for 'eternity'. His Japanese is quite rough and "Yanki." He is illiterate until later in the show. The exact date of his birth and much of his past is shrouded in mystery. His style of clothes suggests he may be of Ainu origin. This appears to be further supported later on by Mugen remarking that he grew up on the same music an Ainu fugitive was playing (though the Ainu man came from the far North, and Mugen came from the far south). Another reason for the similarity may be because the Ainu of the north and the Ryukyu of the south are from the same cultural and genetic stock before being displaced later by the Yamato Japanese. In episode 20 "Elegy of Entrapment, Verse 1," Mugen states that he never knew whom his parents were. The blue tattoos on his wrists and ankles indicate that he was once in prison. The circumstances of his imprisonment are unclear at first, but it is later revealed that he was to be executed for engaging in piracy.