Why is he as fast as Batman while wielding a greataxe? Also "... but they've heard the Samurai are wealthy and have riches hidden in their legendary fortress, so they decide to raid and plunder." Have they ever read about vikings? Or did they just decide to make their own people called "Vikings" based solely on the "raid and plunder" part of viking culture? I'm sorry, but the historical inaccuracy is really off-putting to me.
The vikings were generally scared of/had a lot of respect for the peoples of the far orient, so all they really did with them was to trade.