Ouno (Nounai Disintegration)

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 circle HeartCrown)