Let me introduce you to this character here. This young man is Zacharia Winter, aka Zack. He's the demon Amdusias, a grand duke, or king of Hell. Zack doesn't know this though, but his parents know! See, ever since he was born, Zack has been surrounded by music. It just plays wherever he is, and his parents acknowledged that this is not normal. His parents did some praying and research, and came to the realization that their son was Amdusias.
Said parents are also Christian Universalists who believe that all will be saved, including the demons. They believe that God reincarnated Amdusias as a special human in order to save him.
But enough about the parents! Zack is Amdusias, but doesn't know this. What he does know however, is that he can turn into a black unicorn, and bend tree branches to his will. Personality wise he's cheerful, full of energy, looooooves music, is a universalist Christian, does not believe in free will, or conventional church beliefs, openly mocks who he refers to as the "god of Churchianity", will defend his beliefs with a fiery passion, is gay (but won't have sex.)
And the music that surrounds him changes depending on his moods, so he can't hide them at all.
Anyway, lines? Also, for those playing teachers, which ones won't horribly mind soft classical music playing? He can control the volume, but can't turn it completely off.
As for the unicorn thing? Good luck ever seeing it. Only his parents and his best friend know.