Exotically beautiful, Cardinal Caterina heads the Vatican's special forces team..."Ax." She is the caring sister of the Pope. Although sometimes rough on the exterior, Caterina is a genuinely kind person who would like to see a peaceful co-existence between humans and vampires. In fact, she would often put herself in risky situations in order to negotiate rather than use force.

Lady Caterina cares deeply for every member of her group and often blames herself when tragedy strikes. She is closest to Abel for it was he who saved her over ten years ago. The two continue to work together hoping to eliminate evil and regain peace on Earth.