Guido is the small Italian forklift who helps Lightning McQueen in Pixar's Cars.
Guido works at Luigi's Casa Della Tires in Radiator Springs and is Luigi's assistant. He speaks mostly Italian and is famous for his extraordinary speed during pit stops. In the first film, Guido proves his ability by changing all four of McQueen's tires in a rapid sequence during the final race.
The character's design and name reflect the film's interest in automotive culture beyond American stock-car racing. His tire-shop setting also supports the film's recurring connection between vehicles and human-style occupations.
Luigi is Guido's larger Fiat 500 companion and employer, so their names are easy to reverse. Sarge is a military-style Jeep, while Fillmore is the town's Volkswagen Type 2 microbus. None of those characters is the forklift.