Which Characters Do You Wish Were In The Same Universe Forever?

Every once in a while, we get to see Star Trek cross over with Doctor Who, or the X-Men. Or RoboCop fighting the Terminator. But which universes do you wish would be combined forever? So that, for example, Star Trek becomes the official future of the Marvel Universe?

Please include a picture of at least one of the universes you wish would combine. And please mention their names, and why they'd be so great together. Thanks!