Late to the party here, but I would be super interested in a roleplaying focused game in the Mortal Kombat setting. The setting and characters are crazy, and I think it'd be super interesting if the playerbase held up, which is always the problem.
A lot of people get hung up on the 'death' aspect since it's so integral to the video games, but... storywise characters hardly ever die. Obviously 'kombat' would still be a common thing, but... no more so than most superhero games, I would imagine, with the same result of characters usually being driven off or knocked out.
I'm more interested in the stories and character relationships than anything. Making creative use of the setting and locations. Brutal fights, of course, are A+, but we wouldn't need to get hung up on systems or death, necessarily.
Unless it were OCs-only, and the theme was that you could make as many as you want, but the game's a meat grinder that could kill them at any moment. That could be kind of interesting, but... I really just want to play Mileena or Sonya. <__<
I really wish I knew how to make games, I'd totally work on this and another theme. Heck, I wish there was a way to just tool around with your own grid offline without having to buy server space, but it doesn't seem like it. 