When I was very little I had 4 or 5 imaginary friends. My mom told me a few years ago she used to worry about me, because I would change my voice and pretend to have conversations with them - with me speaking for them. :)
The only one I remember clearly is Goldilocks. She loved to cut off people's heads and eat them with catsup and mustard.
When my older brother and sister would pick on me I would threaten to call my imaginary friends if they didn't treat me better. They always just laughed...
A childhood belief about imaginary friends

others believed things like this
- when i was growing up i had two imaginary friends. One was named Jennifer, the other was named Onion.— Tessica
- I used to have an imaginary friend named Mr. Nobody. He would protect me from my imaginary enemy, Bad Elmer.— Kdees
- My brother was terrorised by an imaginary charecter called anorak doo-dah— Corin
- My little sister's imaginary friend was Kit the talking car from that show Knight Rider.Anon
- I used to believe that one day, my younger brother would be older than me and then he'd pick on me!— Andrew
- My little sister told all her friends that Clint Eastwood was the singer of the band Gorrilaz.. ^^;
— Saffy