Topaz

Topaz is a Marvel Comics character that will appear in Thor: Ragnarok, played by. She is a powerful sorceress, able to cast a wide variety of spells. For some reason, she has fosaken the Masters of the Mystic Arts and instead allied herself with the Grandmaster, acting as his personal assistant. Much like the Grandmaster herself, Topaz is morally ambigous, but is still loyal to the Grandmaster.