Wokou sounded cool and I was bored so I drew a quick sprite (using err... Ninja, Ronin, Ashigaru and Seal Hunter)
I didn't draw an attack sprite since I don't know if that's anything like what you want or if you just want to draw them yourself
Feel free to do anything you like to that, ie cut for other sprites or draw on top on if you wish.
I was tempted to put the harpoon to his other hand, but I doubt that'd look good.