Muramasa (Zanpakutō spirit)

is a mysterious man who has the power to release Zanpakutō spirits from their owners.

Character Outline
Muramasa is a soft spoken man with black messy hair, pale skin and dark marks around his eyes. He wears a white coat with fur around the neck and has extremely long nails. He has yet to elaborate on his powers that allowed him to "free" Zanpakutō spirits from what he calls their prison.

Synopsis
Muramasa is first seen after arriving in a dark cave surrounded by the thus far released spirits of the Gotei 13's and their lieutenant's Zanpakutō. When Haineko approaches him and asks him if they could leave that place, he tells her that they are waiting for the rest of their comrades to be free, and proceeds to introduce a new member in their ranks.

After the Captains, Lieutenants and other Shinigami of the Gotei 13 are summoned by the Commanding General, Muramasa appears and tells the Shinigami who have gathered at the Sōkyoku Hill that their Commander will not be attending and that their spirits are now free from them. After a small confrontation with them, he summons a katana and strikes the ground creating flames and causing the ground to rise.

Trivia

 * Muramasa was the name of a famous swordsmith of the 16th century.
 * He most resembles Ulquiorra Cifer in terms of build, hair and always depressing facial expressions. Also, Ulquiorra grew claws in his second release state, much like Muramasa's overgrown fingernails.