Using this post to keep track of who he's merged with, and what those mergers mean for his own reality.
Merger: Aziraphale (
exensis)
Status: Partial
Crowley and Aziraphale share a common London (though until they fully merge Az won't be able to partake of the mounting disaster that is London/Rome).
Merger: Aziraphale (
extutela)
Status: Partial
These two have started their merging on a slightly smaller scale, thanks to the difference in realities/deviances-Crowley's London is modern and intact, and Aziraphale's has been shattered by Apocalypse. With their first merger, Aziraphale has gained access to the Ritz London of Crowley's reality, and the Hyde Park of Crowley's reality has become overgrown and is strewn with bits of rubble from decimated buildings.
Merger: Henrietta (
fireintothesky)
Status: Partial
Henrietta and Crowley have had not one but two partial reality mergers. The first blended the Via Veneto section of Rome with the Mayfair district of London. The second has effectively created a patchwork city built of Rome and London, in about equal 50-50 proportions. In addition, Henrietta's reality now has Heaven/Hell and the appropriate celestial/demonic entities to go with them, and Crowley's London/Rome has started seeing an increase in terrorist activity.
Merger: Juni (
swanseer)
Status: Partial
Juni and Crowley's realities have begun to merge slightly, with Juni gaining the angels from Crowley's reality and Crowley gaining the demons from hers. He's also got a bit of the magic from Juni's world, and some of the architecture in her world has a new, decidedly British feel to it.
Merger: Hei (
contract_star)
Status: Partial
Hei and Crowley's realities have started to merge based on their...incredibly messed up relationship. Crowley is now the proud owner of one (1) Hell's Gate and a bit of Sapporo's snowy weather (it snows a LOT in Sapporo), and Hei now has the Knightsbridge district of London, including the ability to access Crowley's flat. Crowley is not pleased. With either.