Reading about the Marvel vs. Capcom series, that includes all four titles, including the Ultimate version. I have gotten a very interesting idea for a crossover series of my own.
I have officially named it Square Enix vs. Nintendo.
Characters, stages, soundtrack, and costumes have already been laid out. This weekend and next week backstories, voice cast, and character quotes will be worked on.
The plot will also have to be thought of for story mode. This is also a fan creation of mine, and something I have done in my free time.