Tanya

Tanya, "Baroness", former Claymore No 4. She has a scar across the nose. Her symbol is three circles in a vertical line. She was promoted shortly before her last mission to her rank. After her mind was used to replace Iris' broken one, she became capable of using Iris' ice eye, thinking to restrain other beings with icy threads in her mind. As a mind, she carries out Iris' original dream and possesses some of Iris' memories, much to her confusion. Tanya's original ability, baroness, is a non-combat ability and something that Tanya is ashamed of, calling it dirty and whorish, and presumably involves getting close and physically intimate with the target

Tanya was the captain of the party sent to kill Iris. She was kidnapped by Sullivan in his lair. To save Iris, Blanc used her mind and put it into Francesca's mindless body with Iris' soul.