Reincarnation

Reincarnation remains one of the most ambiguous subjects of the Narutoverse. What is generally accepted is that deceased beings that return to the world of the living do so at the cost of memories of one's previous life and of the realm of the deceased. Despite this, reincarnated individuals tend to retain the behavior and personality of his or her previous life, which remains the largest known indicator of reincarnation.

Very few beings were believed to be reincarnated individuals. Extremely few beings, if any at all, can testify reincarnation from a previously deceased individual.