Just to throw in my two cents on a stripped down roster for a possible Smash reboot...
Mario, Peach, Bowser, Luigi, Link, Zelda, Ganondorf, Kirby, Donkey Kong, Fox, Samus, and Pikachu are absolutes to me. Pokemon Trainer would be there too since Pokemon “deserves” the rep.
Fire Emblem: If it’s two in, I go Lucina and Robin. Lucina makes the cut if it’s only one.
Capt. Falcon and Ness come back as originals who rep their series. Isabelle gets in because it’s Animal Crossing and she seems to be the current, popular AC rep. Past that....I dunno. I’d make an argument for Wii Fit Trainer as the “Retro(?)/WTF/History” entry. As for third party, I’d only consider Sonic or Mega Man. That’s about as stripped down as I could go for a reboot roster before it gets tough.
CHANGE OF SUBJECT
I firmly and completely hate the idea of Steve as a PC in Ultimate. I’m all in on a stage for Minecraft though. Some series would just be better represented by stages rather than characters and Minecraft is the perfect example of that. Advance Wars could be another for that (Though I’d be 100% behind Andy getting in since I love AW) or Tetris. Steve would be the first time I actively despise a character addition to Smash.
Edit and more on topic: Isaac rules! =P