Susatti is end-game because it sounds like a cool car.

Spamrouxlstenna is end-game because Rouxls will make a cool car and drive the NEO Cungadero with Spamton and Tenna.

Mettalphys is end-game because Alphys will build a cool car body that Mettaton will use, out of the refurbished parts of the Knight armor. It will be called the Knight Rider car.

Asgore, Alphys and Mad Mew Mew will solve mysteries and fight crime inside of the MettaKnight Rider.

Papyrus will drive a cool car around town and feel the sweet breeze.

The ships that sail have wheels with tiremark trails.