Ozma was the third leader of the 13th Floor.
Although an innocent and sweet looking girl, she is in fact ambitious and cunning. She is a powerful witch in her own right and regards Frau Totenkinder as a rival.
After Frau Totenkinder left to deal with Mr. Dark, she became the leader of the 13th Floor. At the Farm, she was locked in a power-struggle with Geppetto about the leadership of the Farm. After Rose Red recovered from her depression, she allowed Ozma to become one of her advisors. During the crisis with Mr. Dark, she actively spies on him in an attempt to discover any weaknesses.
After Bigby is turned to glass and shattered by Prince Brandish, Ozma and the other 13th Floor members attempt to repair him, and collect all of the glass shards but one, which was taken by Leigh. She uses the shard to craft a ring that allows her to control the wolf, then replaces the piece, allowing him to return to life, albeit in a feral and violent form. Upon discovering his return, Ozma decides to attempt to subdue him, and confronts him alongside Beast. However, Bigby effortlessly kills both of them, mauling Beast in his armored suit and tearing Ozma's throat out.