Wario

History:

As a boy, Wario idolized his contemporary Mario. He dressed just like him and attempted to have a similar lifestyle, tho Wario's innate dementia took everything Mario did to the extreme. Whereas Mario collected coins and went on some questionable adventures against the forces of Bowser, Wario's greed knows no limits at all and his adventures across the Mushroom World may exceed even that of Mario himself. He's also gluttonous and vain although this has increased his strength to much greater than Mario. Wario could probably takeover the Mushroom Kingdom if only he wasn't a dick to everyone so he doesn't really have any allies, nor popular support of any kind. Not even Bowser particularly enjoys his company.

He hails from Diamond City on an Island somewhere off the West Coast of the Mushroom Kingdom where founded WarioWare, Inc, which specialises in producing Mini-Games. This along with the treasures from his adventures have made Wario quite wealthy, although his greed is insatiable. In addition to WarioWare, Inc, Wario manages a large Stadium in the Mushroom Kingdom, which he outfitted for Kart Racing on his first outing. He also opened up a huge Gold Mine and now has his hand in the production of some of the Coins that litter the Mushroom Kingdom, despite the Mushroom People's indifference to capitalism. It's possible that Wario's wealth rivals even the Toadstool Family's right now, although it will never be enough, and he isn't as willing to spend it developing courses and regions as Mario is.

64:

In order to gain entrance into the MK64 Grand Prix Wario stole Koopa's Kart and painted it in his own colour, purple. He has pretty terrible speed and acceleration and low steering but as a Heavyweight his girth is what lets him push other Karts around with ease. He's generally more on par with Kong than Bowser, as fat but not THAT fat. This really is just the first of many games in which Wario is useless.

Super Circuit:

Wario was similar in Super Circuit and pretty equal to Kong. His speed is only slightly worse than Mario and Luigi and slightly better than Bowser. Likewise he's not as heavy as the Koopa Lord but can still push anyone else around. Despite Super Circuit's Twenty Original Tracks Wario doesn't own a single one.

Double Dash:

Double Dash began to elevate the differences not between separate Racers, but individual Karts. Wario is in the Heavy Class, meaning whoever he is paired with will have to use a Heavy Kart. Each Kart therefore has its own stats while the Drivers mean little beyond selecting the Weight Class. Wario's Ride is the Wario Car, the only preexisting Vehicle in the game, as Wario is seen driving his Car everywhere. Actually that's probably how he's able to travel so much further than Mario. It helps to have a license, bud.

Xzibit can't improve a thing.

The Wario Car is basically a Heavyweight Compromise Car, which is terrible. It's one of the lighter, slower and better accelerating Heavy Karts though its Weight is till 6th and its Acceleration still ranks 17th. Thus it's like a training bra version of some of the Heavy Karts like the Piranha Pipes and the Koopa King that just go for it all. It has alright shocks though and surprisingly one of the best Turn Speeds in the game, though if you're drifting a lot this isn't a huge factor.

In this game each Character has a specific Item, the only thing that makes distinct characters really separate (although this rarely matters). Wario and his partner, Waluigi are one of only three pairs of disparate Weight Classes, Waluigi is a medium version of Wario. Their Item is the Bob-omb, which is one of the most effective defensive weapons, dropping it behind and nailing a lower place is deadly. It can be used offensively, though this rarely hits the intended target and more than likely will utterly destroy your own Kart. What is tricky is dropping it behind only to have it hit a Red Shell or Racer who was directly behind you and subsequently be engulfed in the explosion as well. It's a tough item but can be effective.

There are Secret Staff Ghosts for each track. Wario first shows up behind Waluigi in Waluigi Stadium with a time of 1:59:658. He later switches with his Evil Partner for Wario Colosseum for a time of 2:21:106. Both use the Wario Car.

DS:

Whereas Double Dash introduced the idea of customizable characters with different combinations and different cars, DS featured even more Kart Selections with the possibility of three Karts initially available to each Character. The only major difference between characters is their weight, and Wario adds 3 to each of his Vehicles, meaning he is a bit heavier than DK but lighter than Bowser and R.O.B. Generally there would be a Standard Kart which mimicked stats from earlier games, a weaker Kart with a higher Item Ranking that was useful for Grand Prix if you're prone to Last Place, and a better ride with great stats and a weak Item Ranking if you're prone to First Place. Wario's selection are as follows:

He actually generally has fair stats with a pretty nice Top Speed. This might be Wario's Best Game in fact. The model of the Brute looks somewhat like the Wario Car while the Dragonfly is a Tractor for some reason. Perhaps Wario has some connection to the Donut Tracks? DS also had Staff Ghosts, and Wario is featured on three courses. The first is the DS incarnation of Wario Stadium where he goes 2:14:868 in the Brute. He also uses the Brute on the retro Frappe Snowland, which is strange considering the statues of Mario present. Anyway, his time is 2:08:781. Finally he uses the Dragonfly on the Retro Choco Mountain in 2:15:571. Perhaps it's fitting that he's featured on two courses that debuted with him on 64, although when you think about the dirt of Choco Mountain there is some connection to the Stadium Tracks.

Wii:

This game went nuts with the stats, which includes a specific stat for each of the Six Bikes and Six Karts available to every character in a certain Size Class, as well as specific Bonuses for each character. Wario gets some of the weaker Bonuses in the game. His +3 Weight is matched or surpassed by both Bowser and DK among the Large Class and his +3 Offroad is matched or surpassed by Waluigi, King Boo, Funky Kong and Dry Bowser. Dry Bowser is the only one to match his +6 mini-turbo however. So basically Wario is the same as Dry Bowser except with a bit less Offroad and more Weight. He has nothing that leads the pack. Here are Wario's Vehicle-Specific Stats, Bonuses included:

Wario's most distinctive Ride here is the Wario Bike, which again is a preexisting vehicle. It's actually a very un-Heavy like Vehicle, with low Top Speed and high Handling and Acceleration. With his great Mini-Turbo Bonus though, Wario may be better suited to either the Honeycoupe or Shooting Star. Wario has two Ghosts in the game. The first is Wario's Gold Mine in the Wario Bike at 02:19.585, the Expert of which goes 02:04.800 in the Flame Flyer. He's also in Retro Delfino Square for some reason where he uses his Wario Bike again in 02:41.807, although the Expert blisters across the Finish in 02:24.169 driving the Honeycoupe.