Atre is the vampiric attendant and educator assigned to the vampiric princess Ecute. Her duties include overseeing Ecute's upbringing as demonic nobility and managing the princess's behavior to prevent disruption of her father's diplomatic initiatives with Heaven and other demon factions, a responsibility stemming from a shared mission involving blood bank objectives and diplomatic efforts to sway Yurine. Atre presents a highly formal and courteous demeanor to outsiders, using polite language and stressing adherence to the vampiric king's agenda. This courtly facade often shatters when Ecute misbehaves, triggering violent disciplinary responses such as punching the princess unconscious or demanding finger amputations as apologies, though these demands are typically declined. The severity of her discipline occasionally draws parallels to Yurine's treatment of Jashin-chan. In her past, Atre aspired to become an idol and remains capable of singing all songs by Noel-chan. As a noble vampire, she possesses limited sun resistance, enabling daytime activities with protective clothing or high-strength sunscreen. Her appearance features long black hair extending past her waist, typically worn with a formal black dress incorporating a raised collar and cape.