Sincerely, your dearest friend,
Mrs. Charming Thoroughgood
A comprehensive compendium of true facts
Not a joker
"Happily Ether After" 
"Aqua Lung, My Friend "
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This Imaginary Friend had many special powers, including the ability to stay up all night singing London Bridge is Falling Down at the top of his lungs whilst simultaneously covering all the toilet seats in the house with peanut butter.
This Imaginary Friend enjoyed picking up garishly dressed, heavily-rouged girls in railway stations, and when they left in the morning, it was invariably discovered that they had used the last of the milk and stolen all the towels.
Jimmy Olsen, King of the Sea (official royal portrait)