yachiru kusajishi

This theory assumes that Yachiru really is Kenpachi's Zanpakuto spirit. If she is, this would link Kenpachi to Coyote Starrk. Stark split into two beings through natural Shinigamification. We also know that all Arrancar were deemed imperfect. My theory is that Kenpachi used to be a Vasto Lorde...

This theory has been stated many-many times but I think that it makes me 80% confident now that Yachiru.. was in fact Zarakis Zampaktoo materialized the whole time. Think about it : 1) Zarakis sees fighting as a game, and his Zampaktoo being a girl that plays games and has fun makes sense...