ideas for books

I want mc to be at the orochimaru and sarutobi fight at the end of the chunin exams and go like "a shinigami? That is not a shinigami. I am a shinigami!". I will have mc purify the naruto-verse shinigami when sarutobi summon it, and state that that was just a heavily modified human soul that had traces of both shinigami and hollow powers, that it was probably the result of a human messing with their own soul and that was sealed away by the uzumaki