Yes, if you got permission to make an RPGMaker game out of anything, what would it be?
Stuff in the public domain that no one needs permission to use:
*Alice in Wonderland.
*L Frank Baum's OZ series (Most people only know the movie loosely based on the first book).
Books:
*The Hobbit/Lord of the Rings.
*Harry Potter.
*A Series of Unfortunate Events.
*Batman comics.
Animes:
*Slayers.
*Gensoumaden Saiyuki.
*GetBackers.
*Hunter x Hunter.
*Master of Mosquiton.
*Gokudo: Swordsman Extraordinaire.
*Dragon Half.