Hanabusa Aido (藍堂 英, Aidō Hanabusa?) nicknamed "Idol" by the Day Class girls, Aido is well known among the Night Class along with his cousin Akatsuki to be "Lord Kaname's right hand". His fierce admiration for Kaname borders though extremely loyal, Aido has a tendency to overstep his boundaries, which results in Kaname punishing him if discovered (often by slapping him). A noble-class vampire who can conjure and control ice, Aido often appears cheerful and friendly one moment, but vindictive and cruel the next. In spite of his seeming capriciousness, he is a dedicated and serious individual. A perceptive individual, figures out Zero is a vampire, but he keeps this information to himself without any hidden agenda in mind. He is often irritated at Yuki and her naive ways and he resents the fact Yuki is given special attention from "Lord Kaname". He is temporarily troubled when he witnesses Kaname's killing of a fellow Pureblood and runs away from the Moon Dormitory and imposes himself on Yuki and Zero. Agreeing with Yuki's assertion that he would remain loyal to Kaname even if betrayed by him, he returns to the Pureblood's side.

Aido has difficulty adjusting himself to referring to Yuki in a formal manner following the revelation of her true nature when he is appointed as one of her protectors. During Rido's attack on Cross Academy, Aido protects the Day Class, as ordered by Yuki. Half a year after the incident, Aido becomes Yuki's tutor and protector. After witnessing Kaname kill his father, Aido tries to suppress any hatred towards the Kuran family and collaborates with Yuki to re-establish the Night Class. Hanabusa witnesses Yuki drinking Zero's blood, but refrains from saying anything and instead asks for Rima and Senri to help him snoop around. He follows Kaien in order to track down Kaname but meets instead with his cousin, Kain who blocks his way before leaving him.

When Kain and Ruka arrive back at the Academy, Aido tries to attack them, but they escape. After Kaname sacrifices his heart to the furnace, Hanabusa preseves his idol's body in ice and finds Kaname's notes on transforming vampires into humans. He perfects the process, creating the first method to do so without sacrificing the life of a Pureblood.