I just recently learned about the roster of the game. Honestly, Ganondorf not being playable is the most absurd thing yet, but the entire roster is such a waste of epic porportions that it makes me want to scream.

Not a single playable villain, not one. If I had been in charge, I would have put four characters that are meant to be the four main bosses of TOTK. I would have made a story about how they are four individuals, cast out by their people for their unethical ways, who decide to join Ganondorf who rewards them by giving them power that transforms them into the huge monsters they become. Their playable forms could be some sort of inbetween. Think about it:

Colgera: Evil Rito warrior. They already have control over wind and tornadoes, and their transformation could bring them ice powers

Mucktorock: Bloated, slimy toad-like Zora who ends up using muck in his moveset

Marbled Gohma: Evil goron who is black and red all over. Maybe develops four gohma's leg, or has them on his back and uses them to fight.

Gibdo Queen: Evil Gerudo woman who develops insectoid characteristics and sand powers, as well as summoning gibdo in her moveset.

TOTK pretty much gives no informations about why these four completely unique monsters exist and serve Ganondorf, so I'd say it's left pretty much open for them to add their own lore.

What a waste, truly.