(I believe this is the English title for the Hanzo no Mon mentioned earlier in the thread.)
I have to plug Usagi Yojimbo again. If all you know of this character comes from the TMNT cartoon or toys, then you don't know Usagi. Stan Sakai has created a wonderful, multi-dimensional character and intricate world of places and supporting characters. The art is amazing.
My plan is to start getting my daughter into comic books this summer, so I should start hitting the comic book store again on a fairly regular basis. I will have to look for this; thanks for the tip!
Kogaratsu, and it's even available in English (didn't know that)
Surprised that no one else put this one up. It's a fictionalized version of Miyamoto Musashi's life.
The Immortal Iron Fist and Shang-Chi Master of Kung Fu are my favorites.
OK, so there's a lot of fun to be had in those titles... But this was specifically about JMA in comics.