Artist.

Japanese name: 夢月 うるう (reading is "given":http://twitter.com/xxuruuxx/status/178471367635771392 as Muzuki Uruu) or うるう (uruu)
Circle & site name: Dolce+α (どるちぇぷらすあるふぁ)
Touhou-themed circle name: お月見団子 (Otsukimi Dango)
muzuki uruu