From Disney's Hollywood Studios Wiki
Anakin Skywalker is the main protagonist of the Star Wars Saga, especially the Prequel Tilogy, Episodes I, II, and III, as well as Star Wars: The Clone Wars. Essentially, everything that happens in the Star Wars films has something to do with him. He later becomes Darth Vader.
 Studios Reference
His alter ego, Darth Vader, is also a Star Wars Weekends meet and greet character, and is the main antagonist of the Jedi Training Academy show.
Anakin Skywalker is actually in all of the Star Wars films to date, but goes by that name only in Star Wars Episode I: The Phantom Menace, Star Wars Episode II: Attack of the Clone, Star Wars: The Clone Wars, Star Wars Episode III: Revenge of the Sith, and Star Wars Episode VI: Return of the Jedi.
 Character Synopsis
Anakin Skwalker was born to Shmi Skwalker, supposedly without a father, possibly as an allegory to the Virgin Mary of the Bible. Not to far into the future both Shmi and Anakin were sold into slavery to Watto, a short-fused junk shop dealer, on the dessert planet of Tatooine. They lived their lives the best they could in that situation, and Anakin developed a liking to Podracing, and was the only known human to be able to play the sport. When young Anakin was about 9, he met Jedi Master Qui-Gon Jinn, Jedi Padawan Obi-Wan Kenobi, and young "handmaiden" Padme Amidalla, who Anakin believed was an "angel." After winning the Boonta Eve Classic podrace, on which Master Jinn had bet his ship against Anakin's slavery, Skywalker was freed from his slave bounds and went with Master Qui-Gon to be trained as a Jedi. An unexpected turn occurred when the Jedi Council, the 12 highest ranking Jedi, refused to allow Qui-Gon to train Anakin, stating the fact that he was already training Obi-Wan, and that Anakin was to old to begin his training. Eventually they all went to Naboo, only to discover Padme was actually the Queen of the planet, and was mascaraing as a handmaiden for safety purposes. However, after an Epic Duel with Darth Maul, Qui-Gon was killed, and Obi-Wan Kenobi promised that he would train Anakin, to which the Jedi Council reluctantly agreed.
Anakin learned the ways of the Force very quickly, and the now Jedi Master Kenobi was able to help as much as he could. However, Anakin's desire for attachment to others quickly became an issue, due to the fact that the Jedi Code strictly discourages this. His love for his mother never went away, until he had a dream that his mother was in pain, snuck off to Tatooine, only to discover that she had be captured by Tusken Raiders and was barely alive. Shmi died in Anakin's arms, which infuriated him. Acting upon this anger, he destroyed the entire village of the Tusken Raiders, including "the women and the children."
However, the loss of his mother did not eliminate his need for love, and his infatuation grew for the now Senator Amidalla, and he eventually went behind the Jedi's back, and secretly married her. The two had to keep their love and marriage a secret, because if the Jedi found out he would be kicked out of the order. Which was a trick they kept up surprisingly well, as, eventually, Anakin rose through the ranks, becoming a Jedi Knight.
Whilst in the midst of the Clone Wars, Anakin received the war time rank of Jedi Master and eventually began training his own Jedi Padawan, Ashoka Tano, which was another infatuation that he would soon have to hurtle.
However, the mascaraed of Anakin and Padme didn't last forever, as she discovered that she had become pregnant. Perhaps due to that news, Anakin suddenly began having dreams, similar to the ones he had for his mother, of Padme dying in labor, of which he was bound and determined to prevent that. When the future Emperor Palpatine told him of the power of the Dark Side of the Force, and the fact that it may be able to save Padme. So he gave into his hate, and became Darth Vader, but, sadly, it was this fact that would cause Padme to "give up the will to live," and died having her twin children, Luke Skywalker and the future Princess Leia Organa.
Years went by when Anakin was Darth Vader, but it was his son Luke Skywalker who was able to show him the errors of his ways, and eventually return to the Light Side, by giving up his last shred of life to save his son.
 Performed By
Jake Lloyd - Star Wars Episode I: The Phantom Menace
Hayden Christensen - Star Wars Episode II: Attack of the Clones, both as Anakin and Darth Vader in Star Wars Episode III: Revenge of the Sith, and as Anakin's Ghost in the latest revision of Star Wars Episode VI: Return of the Jedi.
Matt Lanter - The voice of Anakin Skywalker in Star Wars: The Clone Wars.
Sebastian Shaw - As Anakin's Ghost in the original theatrical release of Star Wars Episode VI: Return of the Jedi.
James Earl Jones - As the Voice of Darth Vader in Episodes III-VI.