User blog comment:Mathias Custos/Fandom unite/@comment-25405817-20150729135850

Sounds like an interesting concept. Though I am no expert at fighting games, and I have no knowledge about making videogames in general, I can give you a few advices for this project:
 * Stick to 2D: It is simpler than having the characters move on a 3D enviroment. Mortal Kombat did that on five games before Netherrealm reverted the formula back to 2D. Heck, if you make the characters also 2D, you save yourself the problem of making 3D renders.
 * No story mode: What you are proposing is a massive crossover, with characters that come from completely different universes. Bringing them together would be a convoluted plot point. You may have arcade endings like most fighting games, but a story mode similar to the ones of Mortal Kombat (2011), Injustice and Mortal Kombat X would be a flop with a massive crossover. Speaking of arcade endings...
 * The endings must make sense: This is mostly a nitpick, but the arcade endings have to be a direct consequence of certain character defeating the "final boss". Again with Mortal Kombat X, they made the final Boss Shinnok, but almost none of the character endings have anything to do with said character defeating Shinnok. So, if you'll make arcade endings, be sure that all endings are a consequence of said character defeating the final boss.
 * Don't make up moves: That'd enter fanfiction territory, a disservice. Make all character's attacks, combos and special moves based on actual moves they use in the show, or at least derived from a canon move.
 * Make it balanced: If you'll have a wide selection of characters, make sure that all characters have competitive potential. If that'd mean that X-Ray could be able to defeat Pyrrh-hahaha! (sorry, that's just too cute), then it is a necessary evil if you want people playing with X-Ray.
 * "Test the waters": Your idea is not bound to succeed right away, so you can't give away everything you got in the firts attempt. Make a smaller version of the games, and test the public response. If people like it, then make more of it. My personal suggestion is to stick with RWBY characters for the time being, and then expand to the rest of RT once you have enough support.