The thing is a lot of the names have a negative connotation...does that mean that they're all on Team Evil? I'm trying to put together some patterns, but it's hard to figure out how to group them.

But I think you're right, it's going to be either Tomu or Tomochin as the Dragon King. (Actually, I'm predicting that role for Tomochin, and then Tomu playing another character altogether)

Poor Tomochin, who just wants her pure white role XD