For the first several episodes, Prince Sky poses as Brandon, as he wants to experience life as a normal person, during which time Bloom falls in love with him, and he falls in love with Bloom. One problem: he's already betrothed to Princess Diaspro. Worse, Bloom had no idea, until she attacked Diaspro, thinking her to be Icy in disguise.
Other than that, he's mostly a huge dork.
