Marluxia would probably do well in Atlantica, since he won't be affected by water due to his element. But I do agree that Land of Dragons, Christmas Town, Agrabah and anywhere else that is extremely hot or cold would not work well with him. Flowers and plants can't stand heat or extreme cold unless it's a cactus or a lichen species.
Vexen, pretty much anywhere that is hot. And Atlantica, even though ice is frozen water, water can melt ice.