It's not only one Cars-ified waifu of the week, but two, because they are twin sisters. Kat and Ana are two cute little ninja girls and are two of my favorite characters in the WarioWare series. They may weigh heavier than Luigi the Fiat 500, but they are fairly young. They are both only 6 years old.
Specs
Car: 2x 1994 Autozam AZ-1s
Engine: 2x 660cc turbocharged 3-cylinder engines
Power: 166 hp each
Drivetrain: MR, they both have the same drivetrain
Weight: 720 kg each
0-60: 4.72 seconds
Top speed: 152 mph (245 km/h) each
Quote: "We are ninjas and we are nature's best friends"
Description: Kat and Ana are two young ninja girls and they both like nature and respect all living things. Kat loves animals, where as Ana loves flowers. The only difference is that Kat has a single exhaust where as Ana has two dual exhausts on each side and Ana also has a bigger spoiler than Kat. Kat tries to cut off Ana's 3 other exhausts, but Ana won't let her touch her exhausts. You may think that they are slow, but they are pretty nimble cars and they have been able to outsmart the Delinquent Road Hazards. Kat and Ana are pretty darn smart for their age, but their intelligence is still average at best. Kat and Ana are two cute little ninja girls you don't wanna mess with.