A vagabond with a troubled past traveling who was coaxed in to traveling with Fuu & Jin in search of the Sunflower Samurai. His main goal is to fight Jin and defeat him.
Mugen is an ace swordsman due to his unpredictability and his lack of technic, Jin says himself that he is one the hardest opponent he has faced. He has been to be able to take out multiple adversaries by himself.He is also very durable as he has survived the explosion of boat he was on. He has great reflexes as he is capable of easily dodging arrows. Mugen also learns a technique named Hakkei during the series which seems to consist of launching some kind of transparent wave that damages ones organs.
Mugen is the opposite of Jin. He is vulgar, lazy, impolite and uneducated. He is illiterate until episode 18.