One of my favorite monsters to fight in Oblivion was the Minotaur. Obviously, this creature is borrowed from human mythology. I think it would be awesome to see centaurs make an appearance. What creatures do you want to see?

fenrir, just because it is my favorite myth, although I am not sure where you would find the roots of a mountain, sound of a cats footsteps, or sinew of a bear

Well, Centaurs are already a part of TES lore, they were in Daggerfall. From UESP; "Nomadic, semi-intelligent race that possesses the head and torso of a powerfully-built man and the lower body of a horse. Commonly found in Valenwood."