Beelzebub: Aoi Kunieda

 Aoi was the third leader of the Red Tails before handing control over to Nene.  She met Oga while taking her baby brother to a park and developed an obvious crush on him.  Aoi has two distinct personalities; one of the serious and determined Red Tail leader when in danger, and a kinder and softer side she shows when taking care of her younger brother or around her friends.