I believe in him.Peter Pan is a famous character who may be real (only if you believe).Peyer Pan has been my childhood movie and it still is.If you really believe in Peter all you have to do is say I do believe in fairies I do I do 10 times,sing slow songs about him and tell stories about him and/or his adventures.I've done it before.So I truly believe in him and Tinkerbell too.
But if you don't believe in him or Tinkerbell..well whenever someone doesn't believe in a fairy then they die (and that's what could happen to Tinkerbell if you don't believe) and Peter Pan might disappear or might not go to your house again.So believe in them and they might take you on an adventure.