Not an Avenger.

Tethyst Rooshkleg is old. As old as the ice age. But she's stuck in a teenagers body. She has seen the horrors of the world over and over again. She is a Goddess in Rome, Greece and Africa. Tethys in Greece, Kali in Africa and Distrugere in Rome. All of these names are meaning destruction. She is the goddess of Destruction and ice.
She tries to fit in, meeting Peter Parker at a high school she's attending, becoming friends. But when S.H.I.E.L.D finds her again, she's sour and hesitant from what they did to her before. Then she is asked to become an Avenger.

I don't own marvel Just Tethyst.