now for an opinionated tier list. The sections aren't ordered, because when Melee players still can't decide who #2 is after 15 years, what hope do we have?
Top:
Upper-High:
These increasingly seem to be the generally agreed upon "top 9" because these characters bring in the absolute most consistent results, with all of these characters collectively taking up the majority of tournament wins and highest placings. Beyond that, these characters generally have the strongest theory going for them. Top is separate based on my results chart, and I think Cloud and Bayonetta will decline long-term, but Sheik and Diddy seem to near-unquestionably be two of the best. Is this linked to both having the best neutral games? Probably.
High:
Villager, Ryu, and Pikachu often struggle to maintain the results of anybody else in this category, but Ryu's placings are generally good when they exist. Can't speak for Chu or Killager - both may be supremely overrated, and there may be a reason for their lack of results that extend beyond a lack of a large playerbase.
Meta Knight could maybe be a pick for the 10th spot. Dunno. He's definitely had a lull since the nerfs, but a good Leo performance in the U.S. could change that.
Upper-Mid:
Decently balanced characters with a lot of pros and cons that will give them a persistent tourney presence but probably will prevent them from every placing as consistently as the above few. I doubt any of these characters will ever win majors, but it's not impossible.
Mid:
Could probably use a buff or two to be super-mainstream, and you'll probably need a secondary if you run any of these guys. Duck Hunt and WFT are, imo, underrated, because playing cheap and zoning is highly effective and beneficial with the right amount of patience. Lucas is always 1-2 matches away from being a consistent top 8 presence. Robin and Marth have had a lot of near-accomplishments, but seem to miss out in tournies by a couple of sets from making big-time top 16s or top 8s. Nonetheless, both characters have mains that have taken sets off of top level players, so they're clearly worthy.
Borderline:
You could probably lump this with the above, but these characters are a bit more middling in toolsets and results. Mii Gunner has the strongest results among 1111 Mii Fighters as far as I'm aware, which is more that can be said for Brawler and Swordfighter. Most of these characters have individual/few accomplishments that aren't as notable as the above but are more worthy than the characters below.
-Regi's work with G&W
-Tweek's work with Jr.
-Goggles taking Mr. R to last hit, last stock, game 5 with Kirby.
-JWest doing well against several high-level players and making top 8 in a very tough region.
-Link's recent tourney win.
Low:
All of these guys have middling results but get some decent tools that prevent them from being near-unusable in high level tournies, and 2-3 buffs to fix common complaints could make all of these guys mid-tier. I'd say Dedede and Palutena are underrated as is and that Zard and Falco are overestimated in their capabilities. Mobility buffs for either would go along way.
Bottom:
maybe we weren't wrong when we thought swordfighter was the worst in the game in 2014 ( ͡° ͜ʖ ͡°)