Shunsui Sōzōsuke Jirō Kyōraku’s bankai is unknown, although it is certain that he has one. He has not shown it yet, but in chapter 363 of the “Bleach” manga, Shunsui did admit that he would have to use it eventually.
“Bleach” is a Japanese manga series created by Tite Kubo. The story revolves around soul reapers (also known as shinigami), a fictional race of spirits who are in charge with the movement of souls between the human world and the realm of the afterlife, called the Soul Society. Shunsui Kyōraku is one such shinigami. He is the captain-commander of the Gotei 13, the primary military branch of Soul Society. In a fight with Coyote Starrk, an antagonist, Shunsui was goaded by the latter to show his bankai. However, Jūshirō Ukitake, captain of the Gotei 13’s 13th Division, intervened and warned Shunsui not to use his bankai in the presence of others.