Bleach is packed to the brim with overpowered characters, but there's no doubt that Shunsui Kyoraku is one of the strongest. After the previous Captain-Commander Yamamoto Genryusai falls in battle, the Central 46 unequivocally decides to make Shunsui the next leader of the Gotei 13. A shrewd tactician with a monstrous pool of Reiatsu, Shunsui demonstrates elite proficiency in standard Shinigami techniques such as Kido, Shunpo, and Zanjutsu. These assets make him more than formidable, and the deadliest weapon in his arsenal makes him nigh-unstoppable.
Source：https://www.cbr.com/bleach-captain-commander-shunsui-kyorakus-zanpakuto-explained/
