シャルロット・ディ・カーブホーン・イェーズ

Charlotte is an detective dispatched from Interpol to Hokkaido in order to resolve the case of the phantom thief, Miss Arte. In order to make her life in Japan as normal as possible she attends the school of the protagonist as a 1st year student.
As an detective she is famous for having perfectly resolved 99 previous cases by catching the criminal. She received most of her training in London, living in Baker street and becoming proficient in the martial arts skills known as "Baritsu".

She is Exna Yeatz's younger sister from Kin'iro Loveriche