Anne Frank wrote to a fictitious person named, "Kitty" in her diary. I write to "you" or "him." I write openly and honestly. Anyone who doesn't like it, can stay away.

Kitty is Anne's favourite imaginary friend

Anne wrote that she wanted 'to correspond with someone' and invented several fictional characters (Kitty, Pop, Phien, Conny, Lou, Marjan, Jettje, and Emmy) to do so. In Anne's fantasy, these characters formed a circle of friends.