Ok here we go:

• Ford Chevy and Dodge are arguing over who's stronger all the while arguing who's more efficient, even though they hate each other they will always work together to fight Nissan and Subaru whenever racing is brought up.

• Nissan is the odd, nerdy guy who drones on and on how badass he was as a kid, then continues to draw weird shit in his journal.

• Subaru is running around taking body shots and climbing stairs by the railings even though the rest of the time he just sits around saying nothing.

• BMW is the nerd who grew up to be rich and is in a corner talking to old friends about how he got where he is while his son ,Mini, runs around yelling "Spot of tea old chap!?" In a fake accent.

• McLaren sits around and does nothing for hours on end until he decides to get up and play a drinking game, does absolutely amazing then coasts off that for a few more hours before deciding to do something else amazing.

• Jaguar is talking about how much better shes become and that she finally thinks shes better than the cheer captain just as her boyfriend/trainer, SAAB, pulls her away and tells her she needs to keep training if she wants to beat the captain

• Mercedes is the cheer captain who's been bitter rivals with BMW ever since he stopped being the geek she picked on, secretly they both love each other but love themselves more.

• Ferrari is the rich guy who threw the party and is off to the side making sure everything's running smooth, while his brother, Lamborghini, has just jumped off the roof into the pool, and downed an entire bottle of vodka, completely disregarding the fact he is not a teenager anymore.

• Rolls Royce and Bentley are in a corner talking about how disgusting these poor people are... They have Maybach on the phone because she refused to show up because she thought she'd catch "the poor" and decided to spend the night with her rapper boyfriend who keeps calling her Mercedes.

• Toyota is telling everyone to drink responsibly while his son , Scion, is trying to convince girls he's the schools quarterback despite being 12 and a full-time gamer.

• Alfa Romeo is on speed and babling in botched English promising he'll learn English soon but for now he'll just stick with Italian even though everyone wants him to speak English.

• Mazda is just in the corner doodling but quickly erasing it every time someone compliments one.

• Koenigsegg is making amazing drinks but refuses to make more than 4 every 2 hours.

• Shelby keeps telling people how good of a person she is until her dad , Ford, yells at her to get back in the car.

• Lotus keeps reminding people how fast she was, before looking down at her newly-found gut and sighs.

• Audi, dressed the same as always, keeps telling people how much faster and more efficient she is than Porsche and at the same time eating cupcakes and refusing alcohol because "it clouds her judgement".

• Porsche is high on cocaine and has already built a 3 story house next door but it will take 4 months to open because she has to finish the sink.

• Ariel keeps getting carded because she appears far too small to be an adult.

• Hummer is in a ditch somewhere.

• Saleen is wondering why no one remembers her.

• Bugatti started a foot race with SSC an hour ago and is currently 3 states over and has broken the sound barrier.

• Volvo is sitting in a corner watching everyone kill each other while his bank account grows.

• Tesla's phone died and she's trying to use an outlet to charge it but everyone keeps pushing her away and telling her to shut up, even though she hasn't said anything yet.

• Lexus is BMWs sister and keeps bragging how much better she is than him despite it never being brought up.

• Smart is a little person and didn't show up because everyone makes fun of him.

• Honda has light up shoes and a shirt with various energy drink brands and is wearing athletic clothing, all the while weighing 110lbs soaking wet and plays WOW all day.

• Everyone'spretty sure TVR is dead but he keeps showing up out of no where to do something weird every few hours.

• Maserati is the bartender but he's been making the same 2 drinks for the last 6 hours and just adding a few slight differences to one.

• Fiat is the new kid and is babbling something in Italian.

• Cadillac continues getting compliments on his plastic surgery even though some people are saying he looks odd. He remains smiling, but just because he cant move his face.

• Volkswagen owns the entire neighborhood but hasn't said anything about it, and is currently putting peoples jackets and keys in a room so no one has to worry about it.

• Hennessey has stolen everything in the room including: the bed, the jackets, the keys, the wallpaper, the carpet, the tv, the door, the cabinets, and the glass on the windows. All over the course of 46 seconds and has already sold it all for crack.

• Lancia is still pretending to exist.

• Aston martin is the dashing man talking to everyone who are simultaneously copying him. He has already had sex with you and you had no idea.

• Chrysler is talking to some friends near the pool. Before the party Chrysler had $300 which he planned to spend on new clothes for the party, but his son Dodge borrowed $140 for some clothes of his own, and his other son, Jeep, borrowed another $140 for mountain climbing equipment. Leaving Chrysler only $20 to himself

• Jeep just fell off a mountain, but he said he's fine. Completely ignoring the fact that one of his legs is still making it's way down the mountain.

• Honda is confused where he is and just continues talking about lawnmowers and bikes, thoroughly confusing those around him.

• Hyundai is trying to convince others to drink responsibly. Even though Toyota is doing the same thing.

• Pontiac is dead somewhere.

Let me know if I missed any, I will add them.
Added:

• Ruf is on the phone thanking EA for making him relevant again.

• Zagato has taken 14x the lethal dosage of LSD, then he decided to go to the party, but he never made it there as his car was so aerodynamic it launched itself into the 4th dimension where he found where all the bolts and washers that are dropped on garage floors vanish to.

• Mitsubishi is too busy arguing with Subaru about who was faster as kids to realize they are exactly the same.

• Citroën is making all sorts of cool drawings that people love, after hours of thumbing through 100s of amazing designs he chooses one he likes, tweaks it slightly and then throws the entire design out and builds something entirely different and calls it a day.

• Kia even forgot Kia existed.

• Reliant was invited and is en route, he is toppling downhill sideways as we speak.

• Pagani kept flirting with everyone just to tell them she doesn't get with Americans or that she only kisses 4 guys a year, then makes kissy faces at Mercedes until McLaren gets pissed.

• Saturn and Pontiac are going through their design portfolios discussing future designs without realizing they grabbed Opel and Chevy's portfolios instead. They never noticed a difference.

• Land Rover is a big, strong, well built yet very manicured man. Jeep invited him to go mountain climbing but he politely declined and continued to purview cheese and wine.

• Peugeot is angrily stomping around pissed that half the people there have no idea who he is and the other half doesn't care. So he starts showing everyone his track records and his engineering feats until everyone is impressed.

• Renault is like Peugeot except he's not interesting

• Opel is wondering why everyone's calling him Saturn.

• Morgan is talking about how well built his wooden desk is and how its made of mahogany and infant tears but no one is listening.

• Skoda is the out of shape professional racer, everyone keeps telling him he would be faster if he lost some weight and maybe made himself look better but he keeps babbling in a foreign language so people just go back to forgetting he exists.

• Buick is washing dishes and hoping no one notices him as he hates confrontation, however having run into money recently he looks much nicer, but he still chooses not to compete with the others and just fly low.

• Oldsmobile is in the basement hitting the ceiling with a broom stick even though he doesn't live here.... the retirement home is on its way.

• DMC is the Gerber baby who's coasted off his fame as a child actor for years and still talks about it. He was a terrible actor and constantly broke-down crying mid scene. But he was in a really good movie so there's that.

• Suzuki showed up but no one knew her so she went back to the bike party.

• Daewoo showed up looked around, got scared, and left.

• Fisker is wondering why shes not popular, all the while she never introduces herself to others. She just sits alone and waits for someone to come to her.

• Eagle has no idea who any of these people are and is scared.

• Plymouth keeps challenging Subaru and Mitsubishi to a foot race but they keep turning it down and recommending parkour, because they know they can beat him at that.

• GMC keeps getting confused for his twin brother, Chevy, so he distinguished himself by wearing a $600 plain white t-shirt.

• Infiniti is Nissan's older brother and has run away from home to do his own thing, just to meet up with Nissan here and remember they both use the same builder.

• Isuzu is sitting silently trying to figure out how to pronounce his own name alongside Peugeot.

• Acura has been talking about his new supercar for the last 7 hours but when anyone asks where it is he just replies with its on its way.

Edit: WHOO first reddit gold! Thank you anonymous redditor!! More gold! Thanks Anonymous redditor #2! More Gold! Thank you fellow mindless redditor #3!

Morgan is talking about how well built his wooden desk is and how its made of mahogany and infant tears but no one is listening.