Eos

Eos (エオス) is a character who appeared in All-Star Taimanin.

Background
Below the basement of Gosha Academy library are the ancient ruins of an temple. The gate of the Underworld opened, and someone who came from it built an altar to worship Ushas, the Hindu goddess of dawn, who is also the goddess of the ninjas Marici. At the altar, Eos guards the temple.