Artist.

Nickname: kuuichi09 (くーいちまるきゅー, Kuuichi Marukyuu)
Circle & old site name: 揺れる猫機械 (Yureru Neko-kikai)
Site name: ゆれぬこましーん (Nurenuko Machine)

See also

• Tumblr gallery: http://kuuichi09.tumblr.com/
• Pixiv account: http://www.pixiv.net/member.php?id=3279051
• Nijie account: http://nijie.info/members.php?id=2697
• Tinami account: http://www.tinami.com/creator/profile/14397
• Niconico account: http://www.nicovideo.jp/user/9328879
• Niconico Seiga (empty): http://seiga.nicovideo.jp/user/illust/9328879?target=illust_all
• Twitter account: http://twitter.com/kuuichi09
• Twitpic account: http://twitpic.com/photos/kuuichi09
• Ask.fm account: http://ask.fm/kuuichi09
• Circle.ms: http://c10270582.circle.ms/oc/CircleProfile.aspx
• Blog (deleted): http://yurerunekokikai.blog.fc2.com/
• Old pixiv account (deleted): http://www.pixiv.net/member.php?id=1487804
• Niconico community (deleted): http://com.nicovideo.jp/community/co1622133

(He has some private accounts, too. They're not related to danbooru though.)