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Koga (鋼牙 Kōga) is the young leader of the southern yōkai-wolf tribe, which is nearly wiped out by Kagura and Naraku. 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.

Although Koga always flirts with Kagome and gets Inuyasha mad, it is seen that he has promised Ayame, another wolf demon to be his wife. Koga had promised Ayame, when she was younger, that he would someday make Ayame his wife. Later in the episode, Koga tries to get Ayame to leave by saying he will only marry someone who can see the Sacred Jewel Shards. At the end of the anime it is revealed he did in fact marry Ayame. Although this does not happen in the manga because Ayame is a filler character.

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; he leaves and disappears from the manga, after telling Kagome that she may leave Inuyasha and come to him at any time. In the anime the epilogue reveals that he married Ayame and has become the new chief of the wolf demon tribe (again, he only marries Ayame and becomes chief of her tribe in the anime).