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