I posted this on another thread, but I can't remember which one

I'd imagine Samurai to be a "counter tank". No basic damage mitigation, but some stances that reduce one type of incoming damage and counter. And then, you'd have one combo that puts you in "spell counterstance", another on "auto-attack couterstance", and another in "physical skill couterstance". Each counterstance would only lasts few seconds (6 like Inner Beast could be enough), so timing would be the key. Pretty much like the Swordmaster in Bravely Default (Which could be the name of the class )

And one skill could be something like Perfect Balance, that allows your next weapon skills to gain full benefits of combo without needing the previous steps for a short duration.