From Aozora Wiki
Kelthilda (ケルトヒルダ, Kerutohiruda) is a character in the Aozora's Adventure series.
Kelthilda is a goddess with incredible power, soaring in outer space and looking for danger while wielding her personal whip. Despite being Roman in nationality, her preferred appearance resembles that of a cross between a Roman and an Egyptian goddess.
She serves as Erebos' master and has power that far exceeds his.