Japanese professional illustrator and character designer. Uses "Poyoyon Rock" when doing mostly fanart and game art, and "Akio Watanabe" for anime works.
In board game terms in the west, he's mostly famous for his art in Tanto Cuore. For anime fans, mainly famous for his character designs in The World Only God Knows and Fruit of Grisaya. Also character designer for the video game Chiru Chiru Michiru.