And explain if you please.
My vote goes for Peryite. If they don't put him in this game and make him extremely awesome, they may not get another chance (as dragons will probably be all but extinct again after the end mission).
I mean he is a big awesome green dragon that i assume must be able to repel magic based on his shield (side note, reflect magic should actually make it bounce off him back at you). An extended set of missions involving helping him or fighting him would be fantastic.