Koga (鋼牙, Kōga?) is the young leader of a demon wolf tribe. He first meets InuYasha as an opponent in battle, but becomes a reluctant, occasional ally despite maintaining a strong sense of rivalry with the “useless mutt” about their relative combat strengths as well as Koga’s persistent courtship of Kagome.
After suffering serious wounds, Koga is partially restored by three Shikon shards embedded into his legs and right arm. The shards are eventually taken away from him by Naraku, gravely weakening him. Later he united all of the wolf demon tribes and married Ayame, a wolf demon girl he had long ago promised to marry “on the night of the lunar rainbow” .