Truthfully, I've always been pondering over in my head a spin-off series of the Mega Man X series. Of course, it takes place around the same timeline, but in a different locale with different characters. Canon characters used sparingly, mostly used for "See! I exist here too!" purposes.
Basically, it involves Rick and Dani Cressen, and delves more into the not-really-seen side of the Maverick wars and stuff. Things involving humans, personal issues, and actually have some kind of a deep and meaningful storyline that doesn't really copycat too much. I see the Hunters and the Mavericks having spread out to various cities, like I believe Command Mission has it (though honestly, I haven't had much of a chance to play that one). Storyline wouldn't be all "Golly gee! Sigma's being bad again! We Hunters will stop him!" No, there's a different story and actual motivation for things that isn't "Bad guy is bad, make good triumph!"
Of course, that's not to say that conventional things would be totally abandoned. Eight Mavericks? Sure, why not. Animal-based? Not necessarily. Stage selection? Possibly, in a roundabout manner.
No idea what a name or title for it would be. It's why I haven't developed it way too much, as I don't have the means to ever project it into a medium in a manner as to which I would like it to be.