Board Thread:Questions and Answers/@comment-5398287-20131123183652/@comment-5398287-20131125225148

I'm not sure what you mean when you're saying none of Ichigo's Hollow forms displayed Zangetsu's personality. In case you don't remember, all 4 times that Zangetsu canonically took over Ichigo's body, his personality was VERY evident in his aggressive attacks, his Hollow-like personality (Ulquiorra himself noted this), and his destructive nature. That's not Ichigo. That's Zangetsu.

And as for there not being an inner battle when Zangetsu took over Ichigo, Quincy Powers!Zangetsu stated that he LET Zangetsu take over Ichigo's body because he could not save Ichigo himself.

To sum up my answer to this ridiculous question, Zangetsu is both Ichigo's Zanpakuto and his inner Hollow. At times, he possesses Ichigo's body, but only when Ichigo would otherwise die. The Hollows powers that he displays in these forms (Cero, Sonido) are NOT Ichigo's because Ichigo is NOT a Hollow.