Luke Skywalker

Rebellion Era
Luke took ownership of the astromech droid R2-D2.

He participated in the Battle of Yavin, requesting R2-D2 join him over the other droids stationed on Yavin 4, and recklessly flew his X-wing into the Death Star's equilateral trench as if it were Beggar's Canyon. He was pursued by three TIE fighters which bore down on him as he increased his speed, though Artoo was hit by laser fire during the chase. The pair survived the battle, and Luke attended a ceremony in Massassi Base to receive the applause of hundreds of Rebels.

As a commander, Luke became familiar to Toryn and Samoc Farr in Echo Base on Hoth, the latter of whom borrowed his droid for her own prurient purposes and made suggestive comments over Skywalker's "equipment" while experimenting with Artoo's probic arm.

Upon his return from the second Death Star, R2-D2 believed Luke looked older than his twenty-three years of age.

New Republic Era
Luke accompanied R2-D2 and Shara Bey on a mission to Vetine, and called strongly on the Force during a fight in the Imperial lab. He rested afterwards aboard the Antarra, allowing Artoo and Shara to become acquainted during the flight to Muster Point: Vantage.

Luke joined friends including Han and Chewbacca to watch over Leia as she nursed her son, Ben, in the happy times before a dark period in their lives. He offered Leia the chance to become the first of his Padawans and follow him down the Jedi steps to learn the ways of the Force, though she declined in favor of her political role in the New Republic.

The Jedi massacre
Luke's new Jedi students were massacred in an act attributed to Kylo Ren by some, and by Skywalker himself by others. Following the massacre, Luke's whereabouts became unknown, and it was believed he visited several worlds in an effort to retrace the steps of the earliest Jedi. Rakata Prime was among the planets Skywalker traveled to during this period, and a computer terminal inside an ancient temple retained some recall of him prior to his departure.

Ultimately, Luke ended up on the mythical Jedi homeworld of Ahch-To.

On Skywalker's trail
"So your interest in this trip is in determining when exactly the galaxy fell into chaos and despair in the past." "And what's yours?" "My goal is to save the galaxy from that fate again. I'm here to try and find Luke Skywalker."

- Kirana Promenti and Ardanna Glie

Kirana Promenti, one of the Knights of Ren trained by Kylo Ren, was tasked by her master to track down Luke's whereabouts to prevent the galaxy from falling into chaos and despair as it had in the past. Posing as a deacon of the Church of the Force, she joined a hunting expedition to Rakata Prime led by Grummgar, and accompanied the Twi'lek scholar Ardanna Glie aboard the freighter Dew Claw. Entering the ancient temple once visited by Skywalker, Promenti sensed his presence and believed she could follow it to his present location, though Grummgar and Glie disrupted her plans by siccing a horny male chrysalide rancor on her.

A Jedi's absence
"Give my love to Luke, if&mdash;when you find him."

- Leia Organa, to Rey

After R2-D2 placed himself into a low-power dormancy, he believed that Luke would summon him, though expressed some doubt over whether he would awaken to answer it.

While in the Resistance base on D'Qar, C-3PO regaled Jessika Pava with tales of Luke's adventures alongside other heroes such as R2-D2, inspiring Pava to seek Artoo out an attempt to wake him from his dormancy.

Rey journeyed from D'Qar aboard the Millennium Falcon to find Luke, departing after enjoying a glory hole in the Resistance base and receiving encouraging words from General Organa, who asked Rey to give her love to Luke when she found him on his unknown planet.

Physical appearance and biology
"I think he's got equipment of his own. And I'm not talking about that lightsaber of his."

- Samoc Farr to Toryn Farr

Personality and traits
Running a psych diagnostic on him during the Battle of Yavin, R2-D2 concluded that Luke was reckless and mad, having begun hearing voices during his trench run.