Kai

Kai lives with the northern wolf demon tribe and is witness 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.

in the Final Act he and his brother attended Kogua's wedding with Ayame