NiemandheißtBoshaftigkeit said:
Miyamoto Musashi is argueably the most famous swordsman to have lived (at least in Japan). He was very influential in all forms of swordsmanship and most forms of martial arts in Japan. He was the one who came up with the idea that if one masters the art of the sword, all arts in life will become apparant, since they are all just extensions of each other.
He was in his first duel at the age of 13, and would be in around 60 duels before he died (not in a duel I might add). He lost at most one duel (there is some debate over whether Muso Gonnosuke actually defeated him. The only records of the second duel between him and Musashi were written by Muso's followers, so they aren't exactly reliable). He created the Ni ten ryu school which emphasized using two swords at the same time. He is also one of the few people to have actually used bokken (wooden swords) in battle. In fact it is said that he defeated Sasaki Kojiro (who was known as the best Swordsman in southern Japan) using a bokken that he had carved out of a boat oar.
Later he retired from dueling and created a school of swordsmanship, though this did not last long. He then spent time wandering through Japan (though not in search of duels) and serving various lords (both in instruction of young samurai and in military service). It is in this period that he gains a liking for art and philosophy, which he had avoided before (when he had only wanted to know what he needed to stay alive in combat). He becomes a hermit, and writes
A Book of Five Rings shortly before his death, which has uses in swordsmanship, martial arts, and philosophy. There's also a quote from the fifth book (the void book) in my signature.
There are many legends surrounding his life, from monsters he may have slain, feats he accomplished, other legendary characters that he dueled, and wise things he said.
To me, that looks like a good premise for an anime.