kero_(pukukero)
Artist.
Pixiv nickname: kero
Twitter nickname: ぷくけろ (Pukukero)
See also
* Pixiv account(deleted): http://www.pixiv.net/member.php?id=2303244
* Twitter account: http://twitter.com/p_q_
* Twitpic account: http://twitpic.com/photos/p_q_