壱:Who am i

Izuku yagi is one of mayuri expirment when doing something similar to the nemuri project which result in nemu. thus practical series of expirment involved his curiosity between Wizards and arracancars. so producing a specimen using a human soul on the verge of becoming a hollow. some recoved quincy speciemens , gigai and gikon technology and some of his own spiritual energy. along with some broken zanpakuto that remains from the zanpakuto rebellion arc that he had lying around because he lost interest in that research. This result in the creation of Experiment 666 . a near perfect hybrid of a soul reaper ,hollow ,arracancars ,wizard and quincy . his emotion unstable and the fleeting memories of his human life left him in a rage . thought he found a stranger comfort min nemuri , whom was put in charge of him