To start off, Ganondorf could be the tallest human fighter, being slightly taller than Rosalina; he surely looks to be quite tall. Next, he could receive a weight buff, becoming one of the heaviest fighters, while still being lighter than Bowser and Donkey Kong. Lastly, Ganondorf would be one of the slowest fighters (much like in Brawl), but to make up for his poor speed, he'd be very powerful, with a lot of his attacks delivering high knockback or good damage.
As for the moveset, a combination of his dark powers and swords would be one way to fix him up. Maybe make his swords a special move, so that his other attacks can focus more on his brute force.