Plotforge
AN: New idea time! I've been focused on existing idea's, so it's been a while. I probably won't write it myself, but I am posting it for someone to adopt. While taking place in the Ranma 1/2 universe, it does feature characters from other series, so technically it would be a multicrossover, but that could be altered by whoever wrote it, if they wanted.
World Arena (Ranma 1/2 x various)
Shortly after Ranma & co. return from dealing with Saffron, news stations start to report on the construction of the World Arena; a massive combat arena to rival the ancient Colosseum of Rome, built on a manmade island in international waters. Months later, the Arena is completed, and news spread that the U.N. have fully supported it, and are implementing a plan for countries to each send two Champions to the arena, so that international disputes might be settled without resorting to war.
Needless to say, Ranma is invited to take place in the tournament to select the Japanese Champions. Ranma, never one to pass up a challenge, eagerly accepts. Most of the rest of the Nerima Wrecking Crew end up entering as well, either to try and become Ranma's partner, or to stop Ranma from winning. In the end, Ranma succeeded in claiming the title of champion, with the other champion being his greatest rival, Ryoga. This would have been fine with Ranma, if not for two problems: Ranma had gotten splashed with water just before the tournament, and thus was registered as a female, and the champions from each country share living quarters, so Ranma and Ryoga would have to live together.
The two arrive at the arena feeling confident, but that confidence quickly wanes, as they meet some of their future competition, such as none other than Prince Herb as one of the Chinese Champions, a man simply called Solid Snake from America, and a seemingly harmless blonde from England radiating a dark power whose name was Seras Victoria, and they were just a few of the powerful enemies the pair would face. However, they found that some of their competition were more than willing to be friendly outside of a match, such as the other Chinese Champion, a martial artist named Chun Li, who started to take an interest in the Lost Boy, something that Ranma found herself growing increasingly unhappy about.
As the pair continue to live and fight at the World Arena, however, Nabiki stumbles across some hints that all might not be as it seems, and starts to investigate further. What is the truth behind gathering the greatest fighters on the planet in one place, and who is behind it?
AN: What do you think? If the author didn't like the characters I picked, it would be easy enough to replace them with characters from other games or animes.