Before matching them up, it should be prefaced that this list will only count canon forms shown in the manga and anime, so Ichigo's Hell form, for example, which is only shown in a movie ...

This form of Nel is only seen two times in the Arrancar Arc, never reappearing as an ally to Ichigo and the Soul Society. Now wearing a special bracelet made by Kisuke Urahara, Nel is fully able ...

But this time, Ichigo's Arrancar rival has joined his group in ... It is fitting that his form back when he was a Hollow was that of a panther. While Grimmjow is an incredibly hostile person ...