Zangetsu (Bleached Highschool)

"Ah, sheesh... Did I get stuck with a troublesome King, or what?"

- Zangetsu Zangetsu (斬月, Zangetsu "lit. translation: Slaying Moon") is a major character in the story, "Bleached Highschool." Also known as the Hollow Zanpakuto, he was the Zanpakuto wielded by Ichigo Kurosaki, the hero of the Thousand-Year Blood War. After being sealed away, he was awakened by a dying Issei after the boy discovered the Substitute Soul Reaper badge he was locked away in. As a result of incorporating his Spiritual Energy into him, Zangetsu became apart of Issei, and thus, became his Zanpakuto.

According to Kisuke Urahara and Yoruichi Shihoin, Zangetsu is considered to be one of the most powerful Zanpakuto's in the Soul Society, as well as one of the original remaining Soul Blades from the aftermath of the Quincy Uprising.