The bathrobe samurai doesn't use a fullblade even if he calls it a no-dachi.
He uses a bastard sword in both hands, sometimes he uses it in one so he can grab mooks.
However D&D as built doesn't envision people not wearing armor so bathrobe samurai isn't well supported by the rules.
Now if you do what Star Wars Sage does and conflate Reflex with AC you can then easily be an unarmored front line fighter.
What the OP wants is just a bad build in 4e. If you want to be a samurai using 4e mechanics as they are and not horridly dead after your first fight you need to wear some armor.
Two-handed Weapon Talent wearing Scale (lamellar) or Tempest dual wielder in Hide.
Or maniac, Ki-shouting Battlerager with an Ono (reskinned to be a no-dachi)!
He uses a bastard sword in both hands, sometimes he uses it in one so he can grab mooks.
However D&D as built doesn't envision people not wearing armor so bathrobe samurai isn't well supported by the rules.
Now if you do what Star Wars Sage does and conflate Reflex with AC you can then easily be an unarmored front line fighter.
What the OP wants is just a bad build in 4e. If you want to be a samurai using 4e mechanics as they are and not horridly dead after your first fight you need to wear some armor.
Two-handed Weapon Talent wearing Scale (lamellar) or Tempest dual wielder in Hide.
Or maniac, Ki-shouting Battlerager with an Ono (reskinned to be a no-dachi)!