[MagiRed]

I get the feeling that the "final villain" will either be one of the the "main three" (Kouta, Kaito, Micchy) as Overlords or corrupted by the Golden Fruit, or possibly Duke (I dunno, it seems like he might screw them over in the end and take the Golden Fruit for himself).

The former seems more likely, and I could see Micchy fighting Kouta by turning into an Overlord with the Golden Fruit and having Kouta finally go full Overlord and duke it out as Kaijin like Ankh and Eiji briefly did back in OOO before Kouta turns back into Gaim to finish the job or something along those lines.