Akatsuki is a wizard apprentice and also the leader of his own wizard group, FLAT4.

Spoiler

Akatsuki is the first wizard apprentice to appear and also the first that is suppose to assist Oyajide with kidnapping Hana. Later on, his friends from FLAT4 also join in to help Oyajide. His main plan is to befriend the Ojamajos and earn their trust in order to steal Hana and to this effect he pretends to like Doremi. Later on he seems to genuinely develop some feelings for her. Akatsuki, like the other members of FLAT4, is amazed by the Human World and often skips out on work just to play around. In the final episodes of Sharp, he reveals to the Ojamajos (and the viewers) that he is also the Prince of the Wizard World. (source: soaring_wings)