My favorite genre to roleplay in is fantasy. I enjoy how open it is, as well as how much you bend and twist the world into your own creation. It gives me a lot of creative freedom, in my opinion. As for what genre I would never roleplay in... Well, I wouldn't say that I would never roleplay in one particular genre, since I try my best to be open minded, but when it comes down to things, I suppose one of the genres that I've stayed away from for a long time, is horror with guts and gore galore. Gothic horror is the only horror genre I've ever roleplayed (though I've also tried zombies). But yeah, I usually stay away from things like serial killer horror and splatterpunk- any horror with guts and blood just make me want to puke.