Athena Tennousu

As the former sweetheart and first mistress of Hayate, this member of the Tennousu family shares a deep, nostalgic bond with him dating back a decade. Known affectionately as "A-tan" during their childhood, she lived an isolated life following the presumed loss of her parents. While initially appearing only in brief, melancholic flashbacks, she eventually moves into Nagi’s dormitory, becoming a more prominent figure throughout the fourth season of the series.