There is a few ways this could go...
Michael as a kid could have had a imaginary friend ( that is a girl) and soon he grows older and forgets about her. But now he is lonely and his "imaginary friend" comes to life! and then of course then fall in love. this could be in any era you like.
A girl as a child could have made up an imaginary friend (michael Jackson) and she forgets about him, and later as her life comes tumbling down and she is older, her old friend comes to life! And they fall in love.
I also think i will do a story like one of these
Characters: Original Girl