General Kaliero
F = ma, beeyotches.
If you think about it most (if not all) "Nintendo" Heros have a Child-like innocence and Most nintendo enemys are less Evil than that of your enemys in other games, one notable exception being Ganon.
I assume the one you're thinking of is Bowser, who I admire for being a complex "villain."
However, Ganon, Mother Brain, Ridley, Medusa, Andross, the Black Knight... all serious Nintendo villains. Bowser's brand of fun evil is by far not the norm.
Either way Snake just doesn't fit the Nintendo character equation.
The Metal Gear Solid series is practically
known for Kojima's quirky humor. The Mario series in general, the Zelda series to a lesser extent, the Metroid Prime series slightly (in log entries), Earthbound, the Donkey Kong series, and even Pokemon all have their share of, guess what? Quirky humor. The Smash series is
built upon the absurdity of all these Nintendo characters fighting each other.
Looks to me like Snake fits right in.