ダイアナ・キャベンディッシュ

The top student of Luna Nova who is greatly admired by her classmates and teachers alike. Hailing from Great Britain as daughter of a noble family of witches, she has a serious and arrogant nature and oftentimes clashes with Akko, whom she holds in disdain for her admiration of Shiny Chariot. She also sometimes help Akko correcting the troubles she causes, developing a grudging respect for her persistence.

(Source: Wikipedia)