What about a Pirate who was left for dead by his mutinous crew, who set him adrift on a raft just off the coast of Japan. He is then found by a band of Ninjas who come inches from chopping off his stinky pirate head when the Ninja master takes pity on him and orders them to stop. Finally, after healing and learning the deadly ninja arts, he leads them into battle against his former crew. Backflips or no, those Pirate led Ninjas would be going berzerk and chopping off heads left and right. HARRRRR-YA!