Oh wow. I had never noticed, till I gave this question some thought. Hardly any of my OCs were introduced on their own home planet. Think I have a grand total of two. Maria van Helsing, a vampire hunter encountered in the cliched Transylvania of the old Hammer films. So temperate Earth environment of whatever era had stagecoaches as common transport. Alright, make that one. Edit: Back to two. My Saber Guard, SG12, "Twelve" was born, raised, and trained on Kamino. Weather - rainy as ****. Speculation that the planet used to have land and oceans, but some cataclysm gave the natives time to build their weatherproof cities.