Luke Skywalker

Luke Skywalker is the main character of the Star Wars films A New Hope, The Empire Strikes Back and Return of the Jedi. He is the son of Anakin Skywalker and the twin brother of Princess Leia, and in the expanded universe of Star Wars novels, he eventually marries Mara Jade.

In the films he is played by Mark Hamill. A full character synopsis can be found at Wikipedia.

In Badfic
In badfic, rather than being the son of Padmé Amidala, Luke is sometimes the son of Anakin Skywalker and Obi-Wan Kenobi, or simply a clone of the former.