Artist.

Nickname: 161 (reading may be "Iroi")
The other name: 天ノ川いろい (Amanogawa Iroi) (reading is a best guess)

See also

• Pixiv account: http://www.pixiv.net/member.php?id=235692
• Twitter account: http://twitter.com/_bpm37093
• Twitpic account: http://twitpic.com/photos/_bpm37093