Doujin circles: Pokopii (ぽこぴー), Pokopii & T's (ぽこぴ~あんどてぃ~ず)
A Japanese animator, character designer, and animation director currently living in Tokyo, Japan. He often goes by the pseudonym Poyoyon Rock. He is also a member of the doujinshi circle Pokopii.
(Source: Wikipedia)
Twitter: @punipoyo
pixiv: #16584138