[@Infamous Empath] There are a couple of reasons. The main one is that a good role play needs focus and limitations breed creativity. If I allowed people to bring in whatever they wanted from anime, movies, est, then things would turn into a complete mess pretty fast. By narrowing the scope it keeps everything easily defined and understandable. Plus since I know a lot of video games it makes compiling the loot, enemy, and location lists that much easier for me.