A loyal aide to Queen Celestina and commander-in-chief of the allied forces. The strongest of the Princess Knights and the Queen's personal bodyguard. Her fortress has the best defense of any fortress. In the past, Claudia was trained by one of the strongest and most experienced soldiers in the alliance, Grave Levantine. Through this, she became close to his son Claus Levantine and married him. Extremely respectful of her mentor and eager to make him proud of her.

Could not bear children with her husband Klaus. This greatly disappointed her mentor and son-in-law Grave, as he dreamed of a worthy heir. To this end, he betrayed the princesses' alliance in order to possess her himself and produce strong descendants from her.