Ada Vessalius

エイダ ベザリウス
Birthday: June 2 Ozs little sister who adores him very much. After 10 years she attends Latowidge a prestigious school for nobles of which she is a prefect. She keeps in contact with Oscar via letter and causes Oz and co. to sneak into Latowidge as she wrote that she has found a person she likes. From Wikipedia from the 46th chapter