You cannot create products based upon the IP of other companies. Even when making a “free fan-made game” such as when MainSix tried making Fighting is Magic the My Little Pony: Friendship is Magic based fighting game it was shut down by Hasbro.
If you would like to make a game based upon the themes and art styles go for it. A good game will sell because it is a good game simple as that. Just stick to original IP.