The Doctor meets all kinds of things and people. I love aliens and sci-fi and the makeup and special effects and creatures and beasties! One of the most paradoxical people, to me, are the Oods. In one episode, they're creeping me out. In another, they're the poor slaves with the beautiful song. I love it that Donna is in the Planet of the Oods episode. Love her. Ood is just fun to say too. Lots of O's in this post ;).
Have you read or written any characters that just can't decide what side they are on? Do they switch sides? Are they misunderstood? Or turn by brainwashing or something?