I'm not talking about sales, I'm talking about presence in things like actual games being published (hence Snake being behind, since he's rarely appeared on a Nintendo console while FF does have titles). All of the "Above" franchises had, if I'm not mistaken, as many or more recent games than Metroid. Kirby, for example, has had several after being mostly dormant until the end of the Wii era. Pikmin has only had one, though it got DLC, was well reviewed, and placed early on in a console's life-cycle and featured prominently As far as I'm aware, Metroid only ever showed up as a reference or a costume in other games, like that one Wii U launch title with Mii party games.
It's not about gimmicks, it's about having an actual playstyle rather than just moves that look choreographically coherent. I'm not saying SK wouldn't be able to slap people around, but no one has said anything more specific about what the basis for his standard moveset actually is.
Also, Ridley is poor counter-evidence against gimmicks when Inklings is one of the most gimmicky characters in the entire series.
Ness's placement was an error, I'm not sure why I put it there when it's plainly a dead series, but KI:U was massive and so is the Xeno series.
Punch-Out had a single game on the Wii and before that was dead for longer than F-Zero.
Star Fox is debatable and so you can put that wherever you want. Personally I only hear people complain about it and I didn't see it get any particular emphasis in marketing starting pretty soon after release, but you may well be right on that one.