Akamatsu Mitsusuke

Akamatsu Mitsusuke formerly known by his birth name of Musashi Kusunoki is the elder twin brother of Masatsura Kusunoki, and is a disgraced member of the Kusunoki clan, having severed his ties to it after attempt to take the life of the clan head, hundreds of years later he became reknowed as the 12th Kenpachi dispite bearing no affiliation towards the Gotai 13 nor the soul society as a whole.

History.
Much of Akamatsu's childhood remains unknown, this is because the clan choose to erase the documentation of his birth after he tried to assassanate the head of the clan. The next we hear of him is from the Gotai 13 captians addressing his threat to destory the Gotai 13 and Central 46 in order to return the soul society to what it used be, clans and families ruleing themselves. At the meeting captian Akihiko claims that while he is in fact a renegade he is also the 12th Kenpachi, and that his threats should not be taken lightly.