Just as all Sanses have a thing for stars, the Papyri have a thing for cars.
Paps (Undertale) - Likes convertibles, the cool (and red) the better.
He is an excellent driver and a strict follower of traffic rules. He will always drive under the limit.
Edge (Underfell) - The faster the better! If it were allowed to have a Formula 1 car driving around the city he would have it.
He'll also make a point of customizing it, but unlike the Paps he's opted for the black exterior and red interior.
He follows the laws, but is not as strict as Papys and will (always) drive at the maximum speed limit.
Stretch (Underswap) - He likes cars and knows a lot about them, but he's never been interested in learning to drive (why can he take shortcuts, or sleep on the bus?) and the truth is he gets a little nervous when see behind a steering wheel, instead he collects small models.
If he drove, he would be an extremely cautious driver. As a co-driver/passenger, he can be a bit of a pain in the ass (he never carpools with Edge as he drives at the limit).
Slim (Swapfell Red) - Likes building/customizing cars more than driving them (although unlike Stretch he learned and even finds it relaxing). He goes to auctions or junkyards and finds the worst carcass he can find and then turns it into a shiny new machine.
Paps ends up filming him one of his works one day and Slim explodes on the internet. Razz and Paps set up a YouTube channel for him, which shows some of his work and soon he has a huge following. A lot of people say that what he does is magic (sometimes it's not too wrong).
The pieces he assembles caught the attention of many people and he was invited to work in several repair garages and even by a large brand to design new models, which he dismissed, because for him it is a hobby not a profession.
Slim is a driver who doesn't like to go too fast or too slow and doesn't mind breaking a law or two if it means a shortcut or greater convenience.
Cash (Purple Swapfell) – He appears every time with a different car. One day it's a sports car, the next day a van, hours later a limousine and the next week scrap metal dragged from the bottom of a lake. No one questions where or how he gets those cars anymore, not after he turned up driving a stork truck.
(Slim refuses to touch any car that Cash brings him)
Miraculously he is a very serious driver and almost as strict as Paps (at least when he has passengers).
Sugar (Horrortale) - just like Paps has a convertible, but actually his dream is to own a Monster Truck. Sugar often drags others (and that includes anyone from the other skeletons to random strangers on the street) to watch Monster Jam.
He is an excellent driver, but sometimes he loses his temper and makes risky overtaking or goes over the speed limit (but only if he's alone or with Paps, just to tease him).
Pink (Underlust) – Has a convertible with a pink glitter paint job and an extra battery system (for Tonton). He doesn't mind speeding up or breaking the laws if the need arises.
(For some unknown reason, Pink never gets lost, even when he takes shortcuts along country roads without a map or GPS)
G!Papyrus - he likes old cars that have been “modernized”. He has several models (all customized by Slim) that he treats like babies.
He doesn't drive often, he's one of those weekend drivers who only goes out with his babies to show them off.
X!Paps (XTale) – He's had a car for less than 24 hours. Everyone agreed that he had better rely on the public transport service since then.
Epic!Papyrus – Despite being of legal age to drive, he hasn't started his driving lessons yet, but once he has a car he'll pick something practical yet cool.
Outer!Papyrus – He's heard about these strange inventions that get stuck in the ground and slide on wheels down dark paths and is fascinated. When he finally walks into one he thinks he's going to explode with happiness. The excitement over the novelty is short-lived and soon he's trying to convince Slim to make some modifications to a model for him.
And so the first flying car is finally created.
Honestly, it's not really recommended to hitch a ride with him. He's not a very conventional driver (especially when he gets tired of traffic signals and switches from land car to flying car and breaks at least 20 aviation laws).
Grim (Reaper!Papyrus) – Like Stretch, Grim collects miniature models since his AU doesn't have cars.
As soon as he has time from his job he will take driving lessons...
