My only real squick is body modification (unless it's canon). I prefer m/m slash, but I'm perfectly happy with gen or non-explicit het or femmeslash. No holiday-themed stories (for any holiday), please, except possibly Winterfair in a Vorkoseverse story.
Otherwise, I'm easy. Stick to canon as much as possible (although I like AUs just fine), keep the characters themselves as much as possible and have fun. Very very important that last - have fun.
Much love and appreciation,