Ok, this is gonna be a long one. It's an elaboration of my previous post.
I had imaginary friends from the time I was three. it started with my imaginary "husband" Rocky and "Children." Cindy, Kelly, Kacey, Michael, Rose, Delilah, Eliziana and Kimberly. But it gets better! I had an imaginary twin sister named Michelle (my own name is Machelle, and to me, the difference between pronouncing it Mee-shell and Mu-shell was, like, gigantic!) Even better, we were the princesses of Africa, and our uncle was George of the Jungle. Then there was the imaginary dog, Rover. I use to pretend that I got separated from Michelle when she accidentally touched a magic crystal and got sucked in, and she became my reflection.
Besides my family, who was there from age 3 to about 10 or 11, I had a slew of "Guest star" imaginary friends. There were the girls from the orphanage I went to after being taken away from my Jungle Castle, There was the Chinese girl, Nina, who was abandoned by her parents in our lilac bush. I loved taking her around and showing her how American culture worked.
The Purple Ghost was based off of the sludge thing in an episode of Ghost Writers. He lived in a clock on our wall that looked like a barn and was always doing bad things and blaming them on me.
There was Amanda, who was with me when we were lost in the wilderness (my big backyard) and we had to gather berries and herbs (mulberries, pears, etc) to survive.
later, I adopted fictional charectors into my friends list. Harry Potter, cartoon charectors, and, when I was real little, the Power Rangers.
It should come as no surprise that I really didn't have any real friends growing up :P In fact, my best friend now and I love to play with some of our Imaginary Friends. Did I mention we're 18?
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
- I thought my imaginary friend was real and he imagined me
I hope he still believes I existAnon - My little sister's imaginary friend was Kit the talking car from that show Knight Rider.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