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Welcome to the site, Vulpes. Your play style seems like it would be an interesting one to add to the mix here. Most of the RPs here are planned, so you'll need to make a character. However, there is the Open Roleplaying section that usually has less stringent rules. My personal suggestion, would be Ayenee found here. Granted, that's because I'm actually involved there, but hey, whatever. It's on a planet, open to anything your imagination can create.
Aside from that, jump in where you feel like jumping in. Ask questions when you want, and check out the wiki for quick info.