Just gonna let the people who have played more metroid than myself analyze this.
Well um, let me just go into
debunk mode:
-MGS Char: Fair enough. I believe this. Sakurai said at one point no more than one Third Party Rep per company.
-Metroid Char: Isolation is the staple, fair enough, but not from characters. Out of all of the Metroid games, Samus has teamed up/rivaled with: Ridley, Adam, Anthony, Sylux, Kanden, Weavel, Trace, Noxus, Spire. Those are the characters that have a remotely possible chance (based on being humanoid-ish-ness, not relevancy).
-3rd Party: Well you can expect third parties in almost any smash game now. So this is false off the bat.
-Any PC Game: Well um Mario is Missing was on the PC, so the part about them never making any Pc games is debunked. But most PC game characters won't make an appearance.
Now for the part that made me cringe the most:
-Pokemon: Needs to represent the new games.
-Mario: If Pokemon gets reps, Mario gets reps.
-Zelda: So much potential and space.
-Fire Emblem: Well that's just a given.
DK: Likely, I'll give you that.
StarFox: Eh, maybe. Krystal is sort of likely, but shes been in so few games.
Zelda: Did you just list this twice...