Several years ago, an average rat was sent on a quest to try and accomplish what her brothers had failed to do. A nearby labyrinth to their village was home to a minotaur that was continually destroying and pillaging their food stores. Being part of a family of adventurers, and being the last one capable, all their hopes lay on her shoulders.
Attempting to track the minotaur for weeks, she eventually found her quarry and killed them, finally saving her village. It came with a price, however, as she was unable to find her way back. Thankfully the minotaur's body provided her hide to wear and cover her body while the meat provided her sustenance. The more she consumed, however, the more her body changed, finding herself growing taller, stronger, and forgetting more and more of who she was before.
Instead, she became well suited to the maze herself, withdrawing from society and traditional cultural norms, thinking of herself as a minotaur now. It's hard to argue, with her appearance being covered by a minotaur's hide, giving her the silhouette of one, assorted leather rags barely covering across her breasts and a tattered loin cloth covering her waist. Large muscles able to lift heavy objects, and a strong draw to the maze. Having long since forgotten her name, she adopted one granted to her by the knowledge of the maze: Tangle. Perhaps she has become more minotaur than rat.