League of legends has great potential if he wants to make a movie. In lol there are 10 cities, with the help of them could make a good story. Given that they have over 150 champions in different cities, they could do a great job. And let a little romance into the movie (it would not hurt at all).
And since league of legends is played by childrens would be a great success because children slike the game so they will love the movie (if one would do)