Mangetsu Hōzuki

is the older brother of Suigetsu Hozuki. Not much is known about him, except that Kisame Hoshigaki was acquainted with him at one point. Some people believe that Mangetsu was a member of the Seven Mist Swordsmen, and that it may be the reason that Suigetsu is so interested in them. Note that "Mangetsu" means "full moon."