Ambiguous tag.
- For the artist formerly tagged here, see Koutarou (Girl Power).
- For some other artists named koutarou: koutarou_* | *_koutarou
- For some characters named koutarou: koutarou_* | *_koutarou
- For some copyrights named koutarou: koutarou_* | *_koutarou
