Short answers, pulled from the story.
Luke Skywalker's original surname was Starkiller. George Lucas changed this name during production of the first film released in 1977 to avoid unpleasant connotations with Charles Manson.
Mark Hamill suffered a car accident in January 1977 shortly after filming wrapped on the original Star Wars film. He fractured his nose and cheekbone, leaving visible scarring on his face which George Lucas explained by stating Luke had been fighting for the Rebel Alliance between films.
Mark Hamill won the Saturn Award for Best Actor three times for his work in The Empire Strikes Back in 1980, Return of the Jedi in 1983, and The Last Jedi in 2017. He received nominations for these awards but also remained nominated for his performance in the original Star Wars film from 1977.
Luke went into self-imposed exile on the planet Ahch-To thirty years after the second Death Star fell. Rey found him there and offered his lightsaber to begin training again before he projected himself to Crait where the Resistance was besieged by First Order forces.
Mara Jade appeared in the Thrawn trilogy as the former Emperor's Hand bound by Palpatine's disembodied voice until Luke freed her from the spell. They eventually married and had a son named Ben after Ob-Wan Kenobi's alias.