Soul Revenant

 is a powerful yet not exactly complicated technique. It is regarded as powerful for it's ability to play tricks on the living, not so much it's actual power. To begin, the user will have some object, traditionally something in the shape of a human form, or atleast roughly. A clone made of rock, water, fire, shadow clone, or by some other form of ninpou, or perhaps even a real body, or even a puppet, all would suffice. The user will then, using his contract with the Shinigami, take one of the souls he has stored within his body and lock it within the object. Having both spiritual energy and physical energy, the soul and body, it is capable of forming chakra. While not required or forced, typically the souls preform a henge technique first, if at only to find some comfort in their new body. While these new beings are "independent" so to say of the user, they are bound to follow his instruction, least they simply terminate their soul on the spot.