AH HA HA, WARIO TIME!
You better believe I have a lot to say about Wario. Honestly, I really feel he poorly represents the series as a whole. Not with his wacky, comical movements, those are fine, and do reflect a good part of Wario's uncaring attitude. I just feel there's a poor blend between Wario's various portrayals, heavily overemphasizing the Wario-Ware games over Wario Land and other more combat oriented Wario games. If they tried harder to strike a blend between these various games, I would be fine. At least with other commonly complained about characters, Sakurai at least makes an effort to at least acknowledge what people say he is ignoring. But with Wario, there seems to be none of that, in fact, his only Wario Land tool in his arsenal (Forward Smash, the Shoulder Bash) was axed for a generic punch (and his black and white Wario Land costume was also cut from the game) a very low blow to those who wished for more representation from other games. Sakurai did have a reason (he wanted to make Wario stronger, apparently), but there were many other ways he could have done it without further cutting into the people who wished for a balance between Wario's various games, and while I know this wasn't what he intended, it still comes off as just not caring. He's the only character who I really felt needed many big changes to reflect him as a whole.
Not to say these suggested changes came easy to me. Just the opposite, and take all this with tons of salt. When I looked to Wario's various games to try and come up with alterations to his moveset, I found myself struggling to decide what should be in and what shouldn't (basically, making him feel like brute force Wario from Wario Land, combined with the mellow, relaxed, laid-back Wario in other environments). I also actually found it hard to part with some moves from his official Smash portrayal, because despite being objectively bad to me.... well, I still have fun goofing off with them (and it does make me see why Sakurai was reluctant to make big changes, lol). I wanted to try to maintain that fun while keeping his evil fighter side intact. Blend together his WarioWare and Wario Land aspects. This isn't everything I came up with, but the basic fundamentals. (And I'm still figuring out what I want to do with his Shoulder Bash. It should be there SOMEWHERE).
AESTHETICS
* Someone is certain to ask, so I'll cross this bridge right now. Wario's default outfit is still his biker outfit, because I like it and it fits Wario well to me, plus it helps distinguish him from the Mario Bros. However, just like in Brawl, Wario has 8 variations of both his biker and plumbers outfits. If Little Mac can have 16 alternate costumes, why can't Wario?
* Wario's dash now looks like his running animation from Wario Land: Shake It! His old tap dancing run has grown on me and it reflects Wario's stupid, casual side, so I didn't want to part with it. It is now his walking animation. His general animations are more fluid (but some attacks are still pretty wonky)
* Wario is a bit more expressive. He now sneers visibly during specific attacks (like his smash attacks), and when sent flying a long distance, he looks shocked, as if thinking "How is this happening to WARIO?!" Somewhat related, he speaks more in general; for instance, when KOed off the side, he either says "Do'h, I missed" or "I hate you." This was done to separate him from the silent Mario Bros, and because it made it easier for his personality to shine through
* Wario has an extra idle pose. With a bored look on his face, Wario lazily picks his nose and looks at the booger on it. Similarly, some of his victory poses have been altered. During the victory pose with his bike, he now either says "Wario..... the legend!" or "Now, you obey WARIO!" During a no contest or if he loses the match, Wario does not clap, like a few other characters; instead he faces away, gritting his teeth and closing his eyes in disgust.
GROUND MOVES
* After his neutral attack, he now does a quick strongman pose after the second hit.
* Wario now cruelly grins after preforming his forward smash, up smash, forward tilt, and down tilt.
* His current dash attack's properties are unchanged; however, the animation is different. Wario now rolls, akin to what he does in Wario Land 2 when pressing down on slopes.
* Forward Smash is slightly altered; Wario charges up, and instead of a backhand punch, he swings up in an heavy underhanded uppercut, scowling and yelling out "You suck!" upon unleashing it. One move meant to represent his more aggressive side from his platform games. He can fake it out by holding the attack button after the attack; this makes the move even slower, but he hits even harder.
AIR ATTACKS
*I was going to keep n-air the same, but I liked Runic_SSB's idea of giving it the animation of his current d-air and making it a best of both worlds between both moves, so Imma piggyback off that idea. The rest of his aerials stay the same in function overall. Up air will get it's power from Brawl back, because I really liked killing with it there.
* The exception is down air, which, as you may have guessed, is his Ground Pound. I mean, I really don't see what else I could replace it with. It's one of Wario's most iconic moves, and it would make a beast down air.
GRAB
* I decided to give some of his throws a bit of attention. After all, one prominent feature of Wario in games like Wario World is his crazy throws. He piledrives friggin' dinosaurs, for gods sake! Compared to that, his throws seem a bit... underwhelming. First, his pummel has been changed. He now violently shakes his enemy up and down, like in Wario Land: Shake It! Honestly, should have been his pummel from the start.
* Forward throw received a visual upgrade; instead of slamming the opponent with his ass, he leaps up and violently dropkicks them to the floor. Another move meant to show off his more aggressive side. I know what you'll probably say, hitting people with his ass is also something that Wario would do, and it reflects his character well. I realized that.... so I made his ass slam his back throw again, like in Brawl, removing the Wild Swing Ding. This may be a controversial decision, but I did it for a contrast of his aggression and his crudeness between his forward and back throws.
* To make up for the loss of the Wild Swing Ding, I revamped his up throw. Now, he jumps up and PILEDRIVES THEM INTO THE GROUND, smashing them into the pavement and dealing high knockback, like a total badass, and yelling "Yeah!" afterwards. He bounces up a bit afterwards in the air and strikes a pose afterwards, 'cause he's Wario. If Sakurai wanted to make Wario stronger, this is what he should have done.
SPECIAL MOVES
*Chomp and Corkscrew are entirely unchanged, except Chomp can now throw people backwards, but the basic idea is still intact.
* His side special, I'll spend plenty of time talking about. His bike the other hand has received a few upgrades. For one thing, he has the tires from Brawl back. For another thing, when he rides on that bike, he always takes his hands off when he does a wheelie. Also, I made him look more relaxed when riding the bike in general, and sometimes when he taunts, he lays down on his side, like in Mario Kart 7 artwork (the middle image at the top of the very first post in this thread).
* Wario Waft..... well, he can keep it. He'd totally fart on people. Just a few things; as Quillion said, increase the hitbox size of a full charge Waft. I too, have missed plenty because of the bad hitbox placement. Also, at percents where it kills, both Wario and the opponent pause in place briefly upon a successful hit for a little more than a second, and then the opponent flies to his/her death. If you press the taunt button after hitting with a fully charged Waft, then Wario will yell, "Have a rotten day!"
And now, let me break in to talk about his most famous move. His Shoulder Bash. You may have noticed I did not discuss it anywhere. That's not to say I don't want it in his moveset in some capacity; I really really do. I just couldn't figure out where. My current decision (that will probably go back and forth a lot), is this; he gets it as a custom Side Special (assuming since, it would be easier than ever to port assets directly from SSB4, they actually take the time to explore customization to it's fullest potential). I didn't want to make it a dash attack because I felt Wario's trademark attack deserved better. I was considering making it replace the Bike..... but I just couldn't get rid of it. So I decided for now to make it a custom Side B. It functions just like it does in Super Smash Flash 2, including getting very powerful at the very end, except instead he yells "Hurry up!" upon using it.
So that's my moveset suggestions. I tried a meet in the middle approach. I love the Wario Man's portrayal in both Wario Land and WarioWare, and in my moveset ideas, I wanted to mesh together the best parts of both. I tried to make both the part of Wario that's an evil, buff guy who destroys **** and the part of him that's an uncool, uncaring guy who, as Wario Wario Wario put it so well, "guy who farts on others' faces, bites them and then runs them over with a bike" shine equally, and I hope I succeeded in doing this. What do you guys think? I really want some feedback on these ideas.