What happens when one outgrows the universe? Obviously their size is ENORMOUS, and in most cases the being becomes all powerful. So what if that being desires to interact with the little guys?
Fib has grown just that big and powerful, and he wishes to experience it all over again! So, using his unimaginable amount of power, Fib shrinks to a tiny size, excited to enjoy the feeling of growth once again! Though this new body of his looks a little... different. Simply gazing at Fib's cosmical body is a reminder of how huge he really is, and that he's only around your size just to grow all over again. And to have some fun with you, of course~

Edit and idea made by  Sting1990