The gentle, polite, and deeply loyal daughter of a wealthy traveling merchant. Possessing a refined aura, Klaudia initially lacked friends due to her family's constant traveling. Her life changed forever when she met Ryza, Lent, and Tao on Kurken Island after Ryza saved her from a monster, leading her to become a core member of their secret hideout.

Though she has a kind and gentle personality, there is a hidden side to her that is decisive, resolute, and possesses an unexpected amount of courage. A gifted flutist, she was originally taught by her mother, who suffered from a weak body and required treatment in another town. When Klaudia eventually left her mother's side to travel with her father, Lubart, she noticed her flute playing gave him a sad expression—it reminded him of the times their family was all together. Not wanting to burden him, she hid her playing in secret spots.