Shinenju

The Shinenju (思念珠, "Memory Rosary") is an embodiment of the memories of every that has ever passed through the reincarnation cycle. In other words, it can be said that the Shinenju is the existence of humanity itself, everything that living beings have ever been, crystallized into a single form. When a soul normally passes through the circulation in order to be reincarnated, its memories are shed from its spirit as it is reborn in the. However, in some cases, there are who were ejected from the reincarnation cycle; those who were not subjected to the  nor destined to become. Whatever the case may be, the memories of those souls eventually accumulate and resurface in the world as a single entity. The always believed the Shinenju was an object, but in fact, it is actually a ; one that is often ostracized by the civilization of their era, with some even believing their visions of past lives being a condition of mental illness. When a Shinenju dies, their reincarnation inherits the memories they held while also taking on the memories of newly reincarnated souls since then. It is also possible for a Shinenju to intentionally pass on their status to another soul they may deem worthy.

Powers
History Embodiment: The Shinenju is the personification of all human memory. As such, they possess the entirety of human history within their own minds, and can access this information through training. In most cases, untrained Shinenju only witness fragments of foreign memories, which have often led to many of them being driven mad by these visions; some even being labeled as schizophrenics.

Behind the Scenes
While the original concept is based on the from the first movie, Bleach: Memories of Nobody, this fanonized version was inspired by the Three-Eyed Raven from the television and novel series, Game of Thrones.