Kazuya Eisei

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, feared throughout the Five Great Shinobi Countries as the, is the son of Nagato and Keiko Eisei and anti-hero of the series, driven by the cruelty and reality of the world. Once the apprentice of Madara Uchiha's grandson Draco Uchiha, Kazuya now leads Kurogakure as the alongside his childhood friends Kaiser Enrai and Lumina Seiko. However, after a skirmish with his mother's "killer", Danzō Shimura, his hidden powers of the Eisei Clan awakened, transforming him into a demon lord, making his future among humanity uncertain.

Early Life
Kazuya was born to Nagato of Amegakure and Keiko Eisei of Kirigakure. When he was born premature, however, and was on the verge of death. Although at first he didn't understand why, it was this near-death experience that awakened the Rinnegan.