Well, Nintendo included a stage based on a PlayStation game in Brawl.
We'll ignore the fact that said game has a GameCube remake, requested by none other than Shigeru Miyamoto himself.
But still. MGS is a series mostly on Sony consoles, so...oh wait, MGS has an at least decent presence on Nintendo consoles, huh?
Yeah, Kefka would probably be the most likely inclusion. Or maybe Cecil.
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Currently Playing - Resident Evil 4
Hopefully Next Up - StarCraft, Final Fantasy VII, Resident Evil 2