Anyone out there ever do a Planescape crossover with games from another publisher? For Instance, White Wolf's World of Darkness games Vampire: The Dark Ages and Mage: The Sorcerer's Crusade? Since the Vampire clan Lasombra have shadow abilities, what if one of them got to the Plane of Shadow (the source of their power?) and wandered thru a portal into Sigil? Just watch the poor cainite's face get even paler than usual at the casual mention of "Gehenna"!!! And of course other creatures from the setting could find their way to the Great Ring...
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My new dwarf character is going to be from Rackham's world of Aarklash (a lot of different miniature games are represented in this world LINK).
It mostly a crossover of comicbook fantasy with steampunk, but I don't see why it couldn't be considered a typical prime with all their gods and mentioning of different outer planes.
Outer planes are really vague, so I can say that my dwarven god Odnir is really Odin or Wotan from Nordic mythology, he's just in a different pantheon on this world.
Only problem is that typical dwarves don't have dark vision and that their evil voodoo stitched up brothers do. I'll have to find out another replacement ability.