I want to see Ganondorf again, 7 years is a long time for him to make a proper appearance. Rather than how we usually see him in the 3D titles, as a man who wants the whole triforce to make his wish to rule the world, this story has been done to death with him. I want to see a powered up Ganondorf who is perfectly capable and in the process of taking the world over. I want to see his forces in full action. You know I'd quite like for him to be sealed up in the first third of the game and then have him released somehow, from that point on the threat to the world should become increasingly more obvious and in the final part of the game things are truly being messed up, Hyrule is in apocalypse mode or something.
I'd all be up for seeing Ghirahim again, as the tool of the Demon king he's just the perfect accompaniment to someone like Ganondorf.
I would quite like to see some, maybe not bad people but just those who for some reason have been deceived or extorted into aiding the main antagonist