Mike (the Imaginary Friend)

Mike: "I wish I could eat too..." ~disconcerting stare~

Mike: "Look, Allison, if it makes you more comfortable talking to me, I'll switch to a more human-like form...at least while we're talking..."

Mike: "Does this work for you?"

Mike: "Gosh, Allison is pretty...I wish I were human already..."

...and the Imaginary Friend Metamorphium potion takes effect...