Eh, Belmont wouldn't make much sense either. He was in Lords of Shadow 3DS, but other than that he's as relevant as Snake Nintendo wise, with LoS2 on other consoles.
Edit: at least he'd make historical sense. Then again, Snake did debut on the NES...
Snake didn't debut on the NES. The first metal gear was on PC platforms and eventually got a shitty NES port.
Castlevania... hasn't been nintendo exclusive for a while, but has nearly always been inseparable from their consoles, and most of their games end up on them. Similar to megaman. And I believe that Simon Belmont has never appeared on a game that isn't on a nintendo platform. Either way, there were some Sega castlevania games, playstation 1 castlevania games (SotN), dracula of war, et cetera, but aside from a few instances the main games have always been nintendo games. All of the classic style action sidescrollers were nintendo, a good 90% of the metroidvanias were on the GBA or DS, even in the generation that they made SotN the game that they thought would become the new main games for the franchise, Castlevania 64, was released for a nintendo console even if it was a big flop. The franchise is historically for nintendo.
But it's the fact that, when you go back to classic nes games, among Mario, Zelda, Metroid, Megaman, etc. Castlevania always pops up. It's just one of those games that's always going to be associated with classic nintendo. That's what got Megaman in, that's what got Pit in, and it's why Simon deserves a spot.
Before we get off topic.
Yeah, I do want Simon, but every day it seems more likely Pac-man's gonna be the one
But who the fuck knows?
We might also get Simon too.
I'm pretty sure Sakurai is saving the other /new/ Third Party characters (Again, if any at all) for later to reveal.
How the hell would a bamco character being in cut a Konami character? If they're still on good terms with Konami about ssb, Simon Belmont is a somewhat likely newcomer. I don't think there's a cap to how many 3rd party characters we can get if the characters are relevant to nintendo, so I don't think pacman's candidacy threatens Simon's...