Medusa

A gorgon from Hell who is close friends with Jashin, despite the later seeing her more as a walking cash machine. She and Jashin are pretty close, to such a level that their relationship leaves Yurine a feel of a "boy-girl relationship", with Jashin often behaving like an immoral husband who constantly manipulates her "wife" Medusa for the sake of monetary gain. At the same time, the tender side of Medusa allows her to discover the hidden good side of Jashin, which allows them to remain closest persons and regularly emphasize their strong bonds and interdependence. While outdoors, she wears a paper bag on her head to avoid accidentally turning people into stone.

(Source: Wikipedia)