lol, now i change my mind, petey and rob have great chances of being playable.I just think that if Toad can't be playable then neither should he.
It would be total injustice to have Petey playable over Toad, if he's just a boss character I'm fine with it.
Being part of the storyline doesnt means they cant be playable on multiplayer, remember some characters wil have different storylines, so can be the case of separating villains and heroes.
SEE AT the spaceship the ancient minister is using, its metaknights spaceships giving a huge chance metaknight will also be a villain in this storyline,
so being a very known character on nintendos rooster and being a villain on the space emissary story line just gives more chances they will be in.