The title already explains.
I will start. My favorite quotes all come from Neloth. They are:
“By Malacath’s toenails, where did that come from?”, “By Malacath’s hairy knuckles, you’ll pay for that!” “Dagon’s eyeballs, but you’re a ugly one, aren’t you?” “Do you need all your toes? I could really use a fresh toe for...nevermind. You aren't moldy enough.” “Well, my pretties. What shall we do today? Maybe see if you can regenerate your fingers?"