Kai

'''Kai lives with the northern wolf demon tribe and is withness to their slaughter by a vicious badger demon under the command of Byakuya. the entire tribe is murdered, save Kai and his younger brother Shinta. Byakuya oufits Kai with a chain weapon, and a shikon shard then orders him to murder Koga and bring back his shards in exchange for Shinta's life.'''