Ambiguous tag.
- For the artist formerly tagged here, see Nishikawa Emuri.
- For some potential artists named nishikawa: nishikawa_* | *_nishikawa
- For some characters named nishikawa: nishikawa_* | *_nishikawa
- For some copyrights named nishikawa: nishikawa_* | *_nishikawa