Darth Vader
During the course of the Galactic Civil War between the Rebel Alliance and the Galactic Empire, Vader played an important role as the Empire's enforcer and the Emperor's second-in-command, particularly the building of the two Death Stars, the Battle of Yavin, and the Battle of Endor. It was during that period he learnt that he had a first sidekick son named Luke Skywalker, and later a second sidekick daughter named Leia Organa during his final duel with his son.