Artist.

Japanese name: 雪墨 (Yusumi)
Old names: るーと (Root), るうと (Ruuto) or ちとね (Chitone)
Circle name: 廃棄弁当 ("Kenichi's":http://www.pixiv.net/member.php?id=3420203 circle) 
Site name: 弁天様の裏側
ruuto (sorufu)