Edward Repple

Repple was a Clockwork man, who believed himself to be Shade Vassily, the exiled ruler of Katuria. He was in fact a Clockwork droid, created as a decoy by the real Shade Vassily, who was in hiding on Earth. He met the Doctor and Rose Tyler in 1924, when they became stranded in London.

Biography
Repple was created in London, in the early 20th century. He claimed himself to be the exiled ruler of a land called Dastaria, which did not exist. Repple believed that a man named Major Aske was his jailer, yet found him to become a friend over time. Aske claimed to be a psychiatrist, and stated that Repple was his patient, suffering from delusions.

After Aske's death, Repple revealed to the Doctor and Rose that he was not actually the Elector of Dastaria, but Shade Vassily, the cruel ruler of Katuria. However, the Doctor deduced from the constant ticking that he heard while in Repple's presence that Repple was actually a Clockwork droid. Repple was created as a decoy by Wyse, the real Shade Vassily.

Along with the Doctor and Rose, he stopped the real Shade Vassily from escaping Earth. During this battle, Rose was nearly crushed between two cog wheels inside Big Ben. Repple saved her life by using his arm to jam the wheels, however, he lost his arm in doing so. His arm was later replaced by the Doctor, who used an arm from one of Melissa Heart's Clockwork knights.

Despite being Clockwork, Repple felt human. The Doctor showed him that he didn't have to have blood to be human and encouraged him to enjoy life on Earth. Rose Tyler asked Repple to come visit her in eighty years time; it is unknown if he did so.