I normally don’t go for wild concepts. Sure, I’ve played a misanthrope halfilng druid, or sex-crazed sharpshooter criminal, but nothing too out there. The wildest concept I’ve ever had at my table, though? It was when I was running D&D 4E and one player floated an idea for a replacement character should his PC die that made me decide to try to keep him alive no matter what: A Vampire Pixie Paladin.
I’m sure there are all sorts of meta-game reasons why that’s awesome, but as I have a visceral reaction to vampires (they’re parasitic monsters and thus shall they ever be treated as such in anything I write), I just didn’t even want to deal with that level of cheese.