Some little kids have imaginary friends, but my little sister is the only one I know with imaginary enemies! According to herself, she is the guardian of a land called Dekulina, and she must protect it against the evil House Demons and Voodoos who try to take over Dekulina. There are lots of them, but the ones who always bother us in particular are Twiggus, Porkus, and their father Gordon. Twiggus likes to steal things and throw spikes at people. Porkus is his little brother, and is chubby and lazy. Gordon is the leader of the House Demon Army, and he leads the march into Dekulina from time to time. There are also hazards upon hazards in Dekulina, like the dangerous Neutron Flower that will give you "goofy magic" until you drink the antidote.
I will credit my sister one thing though--she acknowledges the fact that she has the weirdest imaginary "friends" ever. :D
A childhood belief about imaginary friends

others believed things like this
- 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 think people on the telly could see me. I hated getting my pyjamas on in front of Gordon Honeycomb.— Michelle James
- when i was growing up i had two imaginary friends. One was named Jennifer, the other was named Onion.— Tessica
- My friend told me she had invented the expression 'Gordon Bennett' and I believed her!— SueE