Some context: Luke Skywalker is a fictional character and the main protagonist of the original film trilogy of the Star Wars franchise created by George Lucas. The character, portrayed by Mark Hamill, is an important figure in the Rebel Alliance's struggle against the Galactic Empire. He is the twin brother of Rebellion leader Princess Leia Organa of Alderaan, a friend and brother-in-law of smuggler Han Solo, an apprentice to Jedi Masters Obi-Wan "Ben" Kenobi and Yoda, the son of fallen Jedi Anakin Skywalker (Darth Vader) and Queen of Naboo/Republic Senator Padme Amidala and maternal uncle of Kylo Ren/Ben Solo. The now non-canon Star Wars expanded universe depicts him as a powerful Jedi Master, husband of Mara Jade, the father of Ben Skywalker and maternal uncle of Jaina, Jacen and Anakin Solo.
Luke Skywalker was initially called "Luke Starkiller", and went through multiple design changes. The character was at one point designed as a 60-year-old grizzled war hero, later as a Jedi Master, and as a woman. The last name "Starkiller" remained for the first few months of production, Hamill on-camera used the name 'Luke Starkiller" the sole time he referred to himself during filming. "Starkiller" was dropped due to what Lucas called "unpleasant connotations".  An alternative ending pitched by George Lucas for Return of the Jedi was Luke assuming his father's role as Darth Vader after the latter's death and intending to rule in his place. Though Lawrence Kasdan favored the idea, Lucas ultimately declined, since the films were made for children. Another conclusion to the film featured the character disappearing into the wilderness akin to "Clint Eastwood in the spaghetti westerns".  During the filming of the original Star Wars trilogy, George Lucas informed Hamill that he would be needed to reprise the role when he was middle aged. Lucas further explained that his role as Luke would be handing "Excalibur to the next generation". Hamill had no reaction at the time, as he thought of making Star Wars films decades in the future as an abstract concept. Hamill learned of the sequel trilogy over the summer of 2012 at a Star Wars celebration during lunch where Lucas told him one was in development. Hamill recalled shaving his beard to portray The Trickster in The Flash, then letting it grow back for the filming of his scenes.  Luke's lack of screen time in The Force Awakens was due to concerns by screenwriter Michael Arndt that his presence would mean the audience would have less interest in protagonist Rey, leading to an agreement that he be removed from the plot and instead become a plot device. Hamill attended meetings for script readings, and helped conceal Luke's role in the film; instead of dialogue, he read stage directions. Abrams said it allowed him to remain involved and that his reading helped make a "better experience for everyone."
How was Luke Skywalker created?
A: went through multiple design changes.

Some context: A.J. Quartermaine is a fictional character from General Hospital, an American soap opera on the ABC network. Born on-screen in 1979 as the only biological child of the iconic Drs Alan and Monica Quartermaine, A.J. was SORASed in 1991, revising his birth year to 1972. The role has been most notably portrayed by actors Sean Kanan from 1993 to 1997, and Billy Warlock from 1997 to 2003, with a brief return in 2005. Kanan made his on-screen return as A.J. on October 26, 2012, after a 15-year absence.
The newborn A.J. was portrayed by child actor Eric Kroh from 1979 to 1983. Abraham Geary briefly stepped into the role in 1983. The role was also portrayed by Jason Marsden (1986-1988), Christopher Nelson (1988), Justin Whalin (April 1988 - 1989). On June 20, 1991, Gerald Hopkins stepped in the role of A.J. on contract and last appeared on December 30, 1992. The role was recast with Sean Kanan, who made his first appearance in the role on February 16, 1993. Kanan last appeared in the role on June 10, 1997. Kanan received a nomination for the Soap Opera Digest Award for Best Newcomer for his portrayal of A.J. in 1994.  Following Kanan's departure, actor Billy Warlock was hired for the role of A.J., and he made his debut on June 13, 1997. In 2003, Warlock earned a pre-nomination for the Daytime Emmy Award for Outstanding Supporting Actor in a Drama Series for his portrayal of A.J.. Warlock departed from the series in December 2003, amongst rumors that he was fired after disputes with show executives; the network replied his exit was due to lack of storyline.  In early 2005, the network's announcement of Warlock's return as A.J. was briefly put on hold, speculated as contract disputes. Warlock's return first aired on February 4, 2005, and shortly thereafter Warlock announced his return to the NBC soap opera Days of Our Lives as Frankie Brady. Warlock's exit lead to rumors of Kanan's possible reprisal of the role, who had recently announced move to recurring status in his role as Deacon Sharpe in the CBS Daytime soap opera The Bold and the Beautiful. Warlock exited the series in April 2005 and the character was killed off.  On September 17, 2012, Kanan revealed in an interview with TV Guide's Michael Logan that he was put on contract with General Hospital, but his character was not being announced. Rumors arose that Kanan might replace Steve Burton in the role of A.J.'s brother, Jason Morgan; the resemblance between the two fed into the rumors. Kanan first appeared on October 26, revealed to be A.J., retconing the character's death. On March 17, 2014, it was announced that Kanan would once again be leaving the role of A.J.
Were there any controversies with the casting?
A:
In early 2005, the network's announcement of Warlock's return as A.J. was briefly put on hold, speculated as contract disputes.