Ciel

A tall android. Unlike Flandre, who can only say "Fuga", Ciel is capable of normal conversation. In addition to that he also understands Flandre's words. He has memories of working in the deuterium mine of the kingdom some three years prior to the start of the series. While escaping, he was touched by the view of the sea and longed to live a free life. He happened to meet Flandre, while walking in town and helped with the upkeep of Hime's mansion. In the time he was being repaired by Flandre, he developed a relationship with her. However, he was in fact made by Zeppeli only ten days prior to the episode he featured in, and the twenty-seven years of memories he had, were implanted in him.

He tried to capture Hime but was defeated by Sherwood and Francesca. He learned of his false life, and when Flandre was damaged and unable to be repaired. he decided to spare his own part to her. Then, in revenge, went back to Zeppeli and self-destructed. (Source: Wikipedia)