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 ...

And right as Ichigo was about to be killed, she unconsciously activated her adult form. For a short time she regained the power she once had as an Espada, and effortlessly defeated Tesla and Nnoitra.

While Ichigo's new Bankai form was done away without any aplomb, the rest of the fight was fun and had pretty high stakes indeed. With Uryuu's help, Ichigo managed to find Yhwach in a tough spot ...