Elves have Pointy Ears and live for a very long time out in the magical forest. Dwarves live underground, dig up jewels, and are short and like to grow long beards. Merpeople live underwater, have sea-creature features, and sing. And Trolls... Err? Well, they're always big, ugly, brutal, and stupid, right? Except when they're small, Ugly Cute and friendly. Should they be giants with scaly green skin that rapidly heal from any injury except fire or acid? Or something that's literally made of rock and gets smarter when it's in the cold? Or perhaps something that guards bridges from errant goats?