Tin Woodman
The Tin Woodman first appears in "The Wonderful Wizard of Oz", joining Dorothy's quest to see the Wizard in order to get a heart. He had originally been a human by the name of Nick Chopper, but gradually his human parts had been replaced with metal ones. After the Wicked Witch of the West is defeated, he becomes Emperor of the Winkies. He appears in many later Oz books, often alongside his friend the Scarecrow. In the eponymous "Tin Woodman of Oz" he searches for his lost love.