Mythbusters proved that it is actually very hard to break the Katana in hand to hand sword combat. They are just too flexible.
It was quite an interesting episode because they even built a Robot Arm that could swing stronger and with more force and humanly possible, and no breakage.
And yes, the Katana is usually a two handed sword, but Miyamoto Musashi used both his short sword and Katana in combat.
I do understand the Knights code of Chivilary, but I do not trust it as much as the Bushido code of honor.
As well, Usagi Yojimbo is one of the best graphical novel series you can read so I will stick with my Samurai bunny. Laugh it up, but I he would defeat any pirate, ninja, or turtle.