All of this goes back to Melee. Has anyone noticed how pretty much all the Melee newcomers are dysfunctional? There are some outliers of course like Peach and by proxy, Young Link to Toon Link, but the rest are dysfunctional. Even if you ignore Pichu who was intended to be a joke character and ignoring different game mechanics, the Melee newcomers are messes of characters where some are just way too good like Falco and Marth while others are way too bad like Mewtwo and Zelda. Oh, but Brawl has dysfunctional characters too! Yes, all games do, but not to the extent of Melee. In Brawl, the notable dysfunctional newcomers was pretty much all on Meta Knight. Let's ignore the existence of hit stun canceling and chain-grabbing and let's tone down some stupid stuff like Meta Knight's giant sword for a little puffball, weird disjoints like on Snake's Utilt, Diddy's ability to pull out 3? Banana Peels, and weird things like Wolf's inability to meteor cancel until frame 60 or Lucas's grab release problems and you'll notice how they're not all that bad. Captain Falcon and Ganondorf who are regarded as two of the worst Brawl characters were not bad because they were poorly designed, but bad because the game screwed them over. Meta Knight while broken was not to the degree of Melee Falco and Melee Marth who had at times, inescapable kill setups; Meta Knight was just so over-tuned that he made Jigglypuff look like a ground fighter. That was it; he didn't have a frame 1 hit confirm, he didn't have a frame 5 or 6 spike, and he didn't have numerous combos to the degree of Melee Falco and Melee Marth.
So, Melee and Brawl were talked about, so what about Smash 4? Cloud, Rosalina & Luma, and Ryu come the closest as being way over-tuned, but they still pale in comparison to Melee's top characters while Duck Hunt, I suppose, or maybe Palutena or Shulk? come across as the most under-tuned and they're still better than the under-tuned Melee newcomers who are still in Smash. Hi, Zelda. Ryu for instance while having amazing hit confirms and kill confirms doesn't have anything that's frame 1 to whatever that works for pretty much everyone. You can escape his light Utilt, especially if you're an average to low faller. There's also the fact it's not invincible on startup. Ryu also doesn't have access to a godplayer projectile or a 20 active or 10 active frame spike. Cloud while arguably one of the best swordsmen doesn't have as potent of combos as Melee Marth and while he may be over-tuned, his Melee-esque recovery is a big enough weakness in a game where recoveries are usually good unlike say, Melee Falco who with bad recovery or not, did not give a damn when he could 4-stock you because you couldn't deal with him on-stage.
Back to Melee again. I mentioned Mewtwo and Roy way up there. Why? Answer: "Being a DLC character means that development time and balancing were extended". Yes, there is a chance the developers would balance things even without DLC, especially if they were bordering broken like Greninja?, Little Mac's rapid jab, or stuff like with how everyone's yelling at them, Diddy's Uair being too strong and too versatile for a frame 3 move or Zelda's Up and Side Smashes being really stupid. Even then, those are kind of tweaks not complete overhauls... Mewtwo and Roy were overhauled for Smash 4. Yes, they kept their movesets from Melee, but they were redone in a way where they're much more functional in a "healthy" way. Yes, there are some weird things like Mewtwo might be too light - he could be light, but not second lightest - or how some of Roy's moves are like, "What"? Big example is his Dair just being there. At the same time, can you say any of their moves are just bad? Any of their attributes as just bad? Ignoring Mewtwo's weight here. Or if they're terribly designed? No, absolutely not.
Now, pick any of the returning Melee characters and answer those 3 question again. You're likely going to get a yes for most of the characters. Also, like I said with Peach and by proxy, Toon Link, some are outliers who weren't good or bad - ignoring Melee Peach's Down Smash... One big example is Ganondorf who through Brawl was redone in a way where he's still got his roots as a Melee character and a Captain Falcon clone, but at the same time, whatever he had that was way too good or way too bad, were redone so they weren't too polarized. Unfortunately, because of Brawl's mechanics, Ganondorf wasn't able to show it... Then Smash 4 was released. Ganondorf exemplifies a walking tank and a punisher in Smash 4. With more and more tweaks to his moves, he's slowly becoming more realized. Sure, some of them are making him more like the Capt., but was there really a reason his Nair shouldn't connect? Would still have liked his old Nair, but with it being able to connect instead of just a stronger Capt. Nair, but still. Another is Bowser who from the start, was pretty good. He was still the same ol' turtle wrestler, but moved and fought differently... With patches, he's getting better and really good with the recent patch giving him the setup a grappler needs. It's kind of like how people shouldn't get grabbed by Ganondorf's Flame Choke, well, you shouldn't get grabbed by Bowser (or DK).
Some of them, however, didn't have this luxury. Dr. Mario, Falco, Marth, Mr. Game & Watch, and Zelda are still dealing with really iffy design choices. Dr. Mario followed Mario's redesign in Smash 4, but weirdly enough, kept his Melee-esque recovery while everyone else jumped on the Smash 4 recovery ambulance. He's fine on-stage and even off-stage, but there are traces of "Dr. Mario is just a slower, but
slightly stronger Mario". Emphasis on slightly as some of his moves just have 1.22? multipliers on their damage and that's it. In some cases, he has moves that are just worse than Mario's like his Dair kept its Melee startup in a game where Mario's Dair since Brawl had startup halved. The fact Mario's Dair has a larger hitbox doesn't help. Also, sometimes, those multipliers pretty much wreck his combo game like Uair just being slightly stronger throws off what Mario could have done with his Uair. Oh, and the fact the game tells you the Doc's coat is heavy, but there's no actual affect on him besides him moving slower is pretty stupid too. Maybe up his weight, fall speed, and/or gravity a bit. Geez. Still, is the Doc a good character? Yeah, but he has design choices that just seem to not have evolved or were just done haphazardly.
Of the characters I felt should have been overhauled, Marth and Zelda come to mind. Marth came to mind after seeing Lucina using Marth's moveset. It just made sense for her to fight like that since as it was stated, her Falchion's power is balanced... but they didn't do that. Marth's tippers scream he should be fighting like a fencer where he pokes, prods, thrusts, and stabs instead of slashing and even hacking away at people. Marth has only 4 moves where he stabs: Dtilt, Up Smash, Shieldbreaker, and Dancing Blade Down - I consider that as set of a move. If Lucina is the regular Jedi Knight, Roy is Starkiller or Ahsoka Tano, Ike is umm... Obi-Wan? Maybe Mace Windu... Robin is, I guess, a Jedi Consular, so er... Shaak Ti?, and Corrin is Yoda - Force transforms and "moves" his body for fighting like how Corrin can transform into a dragon -, then Marth is and should be the "Jedi duelist". Star Wars fans would know about Form II, Makashi, which is fencing-based than kendo. Apparently, Shaak Ti was a specialist in that, but I don't recall seeing her fight as much as Count Dooku aka Darth Tyrannus and famous Makashi user. Makashi is graceful like fencing and Marth's supposedly the graceful, calm duelist to the fiery, reckless Roy. Why wasn't he overhauled? Marth should have had stabs for Ftilts, a quick series of pokes for jab, perhaps an back-stepped thrust for Side Smash, and that Fair Mii Swordfighter has? Should have been Marth's. Could you imagine the anti-air capabilities of a Ftilt stab? The poking games with jab? The mind-games with a back-stepped Side Smash? Marth would have been glorious! Yes, he would still and should have swipes for some of his moves, but the fact he would be able to aim his Falchion, aim it like an arrow piercing his opponents would be an amazing way to say, "Marth tips; Marth's precision personified." Thing is Marth is still "precision personified", but he's not getting the reward he should while other characters who played with precision are getting much more reward like Fox, Rosalina, Sheik, and ZSS. Hell, even Roy's getting more reward.
Zelda? Do I really need to say anything? Seriously? Do I? Zelda is a stagnant character since Melee, but somehow manages to get worse in each game. It's not noticeable because she's always in the bottom of tier lists, but it's pretty appalling. Oh, but Captain Falcon, Fox, Jigglypuff, Kirby, and even Mario are stagnant characters. Yeah, they are, but they don't become worse do they? The Capt. as I said, was screwed by Brawl's mechanics, but otherwise, would have been a good character, Fox was always good, Melee's mechanics just boosted him up higher, with recoveries being improved per game, with toning down, and with aerials pretty much being nerfed in Smash 4, of course Jigglypuff would go down, but here's the thing, Jigglypuff's still doing fine and would be doing fine if they didn't weaken her air game that severely, and then Kirby and Mario. Pretty average characters... Mario being more speedier and more combo-centric pushed him from average to above-average while Kirby kind of stayed average in a game where a ton of characters are average. They're getting there with Kirby, but man, does Kirby's track record crap on Zelda's. They know not just from fans, but from their own testing that Zelda is not a good character at all. When you give a character 3 Luigi Super Jump Punches, but weaken their reward and somehow even making the sour-spot as bad as Luigi's Super Jump Punch sour-spot despite it doing 3% more is when you know you royally ****** up. It's really freaking stupid not to mention surprising, because... HOW? Also, they managed to break her Up and Side Smashes after fixing them in Brawl. What the hell, developers? What the hell? Thankfully, patches exist, but no amount of silly, purple frog band-aids can fix Zelda if they stick with her current design. You can in fact overhaul her without changing any animations. They can easily change her Bair for example, into a Samus Bair and her Fair into a Lucas Fair just by altering knockback and damage. Easy, right? WHY AREN'T THEY DOING IT!? is the freaking question!
As a vocal Falco ranter, you probably know what's wrong with Falco is you read anything I post. One thing I want to point out that will inevitably lead into a paragraph worthy of a PhD in Smashology is that the developers couldn't figure out if they wanted to copy and paste Brawl Falco without obvious nerfs to his broken tools or fuse him with Wolf. Pick one and go with it, right? Nope. Falco has traces of the first option which is notable with pretty much all of his moves except for obvious ones. For instance, Brawl only changed Fire Bird by making it a multi-hit and giving it a hitbox while it charged... Smash 4 didn't change it at all and I wouldn't be surprised if Fire Bird's connection was bad in Brawl too. Another is Blaster which kept Brawl's frame data, but also kept some of Melee's... It seems like obvious nerfs to his Blaster, but the shorter range and slower firing rate seems reminiscent of Melee's. They could easily bring it closer to Melee's by increasing the startup which would lower the recovery frames if they leave the total frames which they've done since Brawl. The second option is obvious with his Bair animation, Up Smash functionality, and even Dair's startup. One subtlety would be Falco's fall speed matching Wolf's. If they went with this route, Falco would not have had a projectile issue considering Wolf's Blaster having better frame data while being a fairer and less annoying projectile, but there would be issues that clash with Falco's design such as Falco is a high jumper while Wolf's a low jumper and not to mention the implications of Falco having high air speed when he has fast and strong moves. You really do not want Falco to have air speed like Greninja and ZSS when he could easily jump all the way to blast zone, put a Nair or Fair wall and murder you. For Falco, it's like the couldn't decide what to do with the pheasant.
This image always felt like Falco was planned with his Melee and Brawl Bair, but it was switched later on with Wolf's and Wolf may have been in development, but dropped for various reasons like because of Star Fox Zero, having Wolf in the game would spoil his design which is different than Dante and Raiden appearing in PSABR because their new designs were known unlike Wolf's. Or maybe something else, like maybe the developers didn't know another Star Fox was being developed, so they cut Wolf or maybe they knew, but since Wolf wouldn't look like Assault and Command Wolf, having him fight with claws might be a bit weird, but then again... Iori Yagami.
I end with this: a lot of the Melee newcomers are getting tweaks to improve them. Some already because of Brawl and some because of other reasons like Bowser, Mewtwo, and Roy. The rest are having incremental tweaks to them which isn't really that great all things considered. Could an overhaul happen? If you count Mewtwo's mobility buffs as an overhaul of a character, then sure, it's possible. In some cases, it might even be possible to overhaul moves since they have assets to do so e.g. Wolf Flash could easily be given to either Fox or Falco and Ness having Lucas's Specials and Dancing Blade just being a differently tuned Double Edge Dance meant they really didn't have to do much, but do some tweaks to fit Lucas and Roy. Also, Lucas for the most part looks like Ness if he didn't wear a hat and backpack and had a pompadour. Could it and would it happen is the question. If say, Falco received Wolf Flash, it would have to be renamed to like Falco Flash and in-game tips would be to be altered or even removed like the tip for using Falco Phantasm right after hopping won't apply to Falco/Wolf Flash and what about Falco Phantasm? Where will it go? They could just give it to Fox as a custom and say Falco something like, "Fox's version of Falco Phantasm isn't perfect, so he can only spike for the first half of it", which you could even say is a reference to how Charlie perfected Sonic Boom and can use it one-handed while Guile can't, so he has to use two hands. Or imagine if Dr. Mario was given Fast Pills instead and they explained as Dr. Mario needing to be quick for stopping diseases.