[quote=@Silverlight138]
Out of curiosity, could the unlockable characters possibly be god and satan? I noticed that they juxtapose each other, and the likes listed under "powerful demon" could be a reference to the seven deadly sins. Well, I don't know.

EDIT: Oh I just noticed scarlet's comment:

"Also, I already figured out one of the unlockable characters. The English title of the song is right below the other version of the song."

^What? Where? I don't see it D:
[/quote]

Okay, might have figured it out. And I had it up on my phone, so it might not be there now, but there's the English version of the song on the side with the recommended videos to watch. At least, I think that's what it is. It might not be...