Make sure you check the schedule when you go in, as the Meet and Greet at Adventureland of Aladdin and friends is one of the earliest to close (in July it was done at 6 or 7, so I imagine Dec is maybe even earlier.
I had one CM give me the advice that they came out on the hour, and were there for about 1/2 hr or so and then gone again until the next hour. If this is still true, it is a great idea to go there and line up about 10 minutes or so before the hour, as once the characters are there the line grows very quickly.
It is in a small area just on the far side of the Flying Carpets (away from the Jungle Cruise) beside the store. I personally have only seen either Aladdin and Jasmine or Aladdin and Genie there.
At Epcot, the character greeting spot is also easy to miss in Morocco, but is marked on the map. We met only Jasmine alone there, but I assume other characters are there sometimes.