Zangetsu

Zangetsu(cutting moon)Unlike most Soul Reapers, who can seal their zanpakutō after releasing it.The Zanpakuto is actually Rukia Kuchiki's, but blown up to a larger size due to ichigo's spiritual pressure.

Zangetsu's spirit takes the form of a middle-aged man, voiced by Takayuki Sugo in the Japanese anime and by Richard Epcar in the English dub.Zangetsu is portrayed as wise and calm in most matters, and fond of testing Ichigo in unusual ways, many of which have a purpose completely contrary to the stated goal. Zangetsu's special ability is the Getsuga Tenshō ("pierce of heaven"), a wave of spirit particles released from his blade's edge.

Zangetsu's bankai, named Tensa Zangetsu shrinks the sword down to a fully black one while his uniform also changes to an outfit similar to Zangetsu's. Ichigo's bankai is a compression of his spiritual pressure, rather than a vast expansion as is usually the case. By compressing his power, Ichigo can move at incredibly high speeds, though the form puts tremendous strain on his body.