Know that the Dark Multiverse is shaped by the emotions/fears of the universes above (basically like the Warp from WH40K). For example, a Dark Universe version of Earth 10 (Earth -10) would have a gay black jew batman.
Besides Batmen, I would love to explore other potential versions of existing characters. For example Cyborg, Catwoman, Plastic Man, Superman, Deathstroke and others.
Anyone else want to see a Dark Multiverse version of Lobo? A Thrash Metal Kang the Conqueror.