Samurai were very precise and had the whole honor thing (as well as scared to death of ninjas) the did what their master said when they said it. they were excellent combat soilders and yet not nearly as exploitable as the ninja in a game like this, it would be just a variation on the warrior.
The Ronin were masterless and somehow i see this community would rather be the lone rogue masterless samurai wandering around looking for work, this could allow your character to have that touch of badass attitude or something.
I only know a little of its history so if anyone knows more of them please post
