Darth Vader's daughter is Leia, a four-letter word. Leia is a major character in the Star Wars franchise, first appearing in the original 1977 film. She is the twin sister of Luke Skywalker and the daughter of Darth Vader, the main antagonist of the original trilogy. Leia is a leader of the Rebel Alliance, a member of the Imperial Senate, and later a general of the Resistance. She is also a member of the Skywalker family.