Sugawara no Michizane
The comic artist Mizuki Shigeru surmises that in the backdrop of the ushi-oni are the ancient Indian ox gods, so the incarnations of Daijizaiten (Shiva), Izanaten (Ishana) and Enma-ten (Yama) are related, and that also related is the existence of the Tenmangū that shrines Sugawara no Michizane (who is also Tenman Daijizaiten).