oni_tengu
Artist.
Not sure if the artist and this niconico user are the same person.
Japanese name: 鬼天狗 (Oni Tengu)
The other name:イヌ or 狗 (Inu)
See also
* Pixiv account: http://www.pixiv.net/member.php?id=5669015
* Pixiv novels: http://www.pixiv.net/novel/member.php?id=5669015
* Pixiv account (for pixiv projects): http://www.pixiv.net/member.php?id=10367053
* Twitter account: http://twitter.com/onitengu0
* Twitpic account: http://twitpic.com/photos/onitengu0