My little sister's imaginary friend was Kit the talking car from that show Knight Rider.
A childhood belief about imaginary friends

others believed things like this
- I used to believe, driving in front of all the other cars on the highway, Knight Rider was leading the pack.— Michael Kolassa
- I used to have an imaginary friend named Mr. Nobody. He would protect me from my imaginary enemy, Bad Elmer.— Kdees
- cause i'm just a paper bag rider....
or it might have been paperback writer by the beatles....Anon - my aunt used to have an imaginary friend who instead of having blood had 7-up in her veins.Anon
- When I was about 6 or 7, I had an imaginary friend, who left for ice-cream one night. He never returned.— His name was Jimmy
- I used to believe in my imaginary friend dooodle.
Doodle was a stickperson and was always smiling.— Samantha