What is ichigo's strongest form?

Ichigo Kurosaki's strongest form is widely considered to be his "True Bankai" or "Final Getsuga Tensho," which he achieves during his battle against Aizen. In this form, he becomes a manifestation of "Mugetsu," gaining immense power and speed at the cost of losing his Shinigami abilities. This transformation showcases Ichigo's peak strength and allows him to defeat formidable foes, solidifying his status as one of the most powerful characters in the "Bleach" series.