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You may be looking for the canon character from Till We Have Faces.

Agent Orual is an assassin in the Harry Potter division who works with Agent Gus McFerrin. She was written by Tawaki.

Orual is a hag from the Narniaverse. She was originally recruited by Tawaki and Nick from a Chronicles of Narnia badfic, where she had been an opponent the Gary Stu and the Pevensies were to fight. In her home fic, she was vaguely described as a woman with "long ugly hair and a misshapen frame."

She is best known for, with Gus, stumbling across the secret of Pink and Purple Stuffs on a mission.[source, please!]