4. Mario - Sonic
Technically we have already had this crossover but Im not going to count a sports game as a true crossover. Mario and Sonic have been rivals since the hedgehogs inception in 1991. Admittedly Sonics star has fallen a lot over the past decade but nonetheless the two carry enough star power and nostalgic value to make a crossover a massively memorable event. As the world of video games evolve so must the characters. So age more gracefully than others, which was the case with Mario and Sonic. The plumber took to the evolution of 3D and open-worlds like a duck to water, whereas the hedgehog, who thrived in the 2D side-scrolling world, fell to the wayside. There have been some decent Sonic games but its never been the same since Sega called it a day as a home console creator, that was the day Mario won. I dont need to explain who the characters are or why theyre so successful, the question is why hasnt a crossover already happened?! These are arguably the two most iconic video game characters ever and theyre never truly crossed paths in a game. I think wed all love to see a real open-world 3D game that incorporates the best of both worlds. While Sonic games have been hit and miss, the formula of running gets a tad old after a while, it would be given a fresh lease of life when coupled with Mario. Mario games are rarely disappointments. Adding Sonic to that formula cant be a bad thing, can it? I wouldnt imagine so but stranger things have happened. Much like Jak & Daxter and Ratchet and Clank these two worlds could easily collide with little to no explanation, fans wont care why theyve suddenly stumbled upon one another. Its fairly easy to imagine a plot in which Bowser has enlisted the help of Dr Eggman to finally defeat Mario, and hearing of the plot Sonic comes to help said plumber. Of course there could be a litany of mini-encounters too, from Tails meeting Luigi, Peach trading beauty secrets with Amy Rose and Shadow hatching plots with Wario. Even just picturing the spectacle of the characters on screen together and the humour to be had from such scenes would make the game worthwhile. The mixture of gameplay and aesthetics would be more than enough to please fans of both series and be a critical success. Theres a lot to be had from a Mario X Sonic game, which, given the success of their sports games, isnt out of the question. Hopefully.