Hmm, I don't know if I'd recommend it exactly, as a round robin quality could vary wildly and it's been so long since I read it I can barely remember more than the occasional snippet, but how about Magical Troubleshooting Crossover Fighting Federation ULTRA? A WWE style fighting federation started by God Herself, Kasumi Tendo, featuring everyone from Dan Hibiki to Lina Inverse. It had a prequel MTCFF Beta, which is how Kasumi became God, but that seem to be unavailable.
http://mtcffultra.com/
http://mtcffultra.com/