Artist.

Japanese name: 奥之 (reading is given as Ouno)
Site name: 脳内ディスインテグレイション (Nounai Disintegration)
Old circle names: ララリリル (Rarariruru) or EarthBound
(He's also a member of "Arumi_Tamago's":http://www.pixiv.net/member.php?id=71471 circle HeartCrown)
ouno (nounai disintegration)