"I bear many titles and perhaps, in a way, there is a drop of truth in all of them. The only thing I can confirm, at least, is that I'm a man who sees things through the end. If you ever need someone to do a job you cannot, just hire me to do it. I always pay back my favors tenfold, after all."

Born from a wealthy pair of merchants, Skye (whose birthname had been Leon Kramer) was an intelligent kid that was pretty much the only one to inherit his parents' trading business. As they were one of the few merchants willing to deal and come contact with the Lawrence Clan, Leon had many opportunities to come in contact with a young Eula Lawrence and forge a well-meaning and wholesome friendship. Upon reaching a reasonable age, his parents had begun showing him the ropes of the trading business, often leaving and travelling around Mondstadt (and eventually, even the neighboring nation of Liyue) to gain more experience in the long run.

Around this time is when the family would last make a trip outside of Mondstadt together. As they were hurrying through Stone Gate, they passed by a similar caravan heading towards the opposite direction. The family paid it no mind up until the screaming and sudden shouting began. As the two caravans crossed, a pair of Lawachurls appeared, blocking the way. The monster destroyed the caravan the Leon and his parents were on and similarly, the other caravan seemed to be in a similar situation as his. Trying to get the two children to safety, their parents had sacrificed themselves to bid more time but had not managed to do much, getting swiped and thrown to the side like ragdolls. Upon seeing their parents in that state, both of them awaken their Vision in the middle of the crisis and managed to fend off one of the Lawachurls. Before the two children could do anything further with their newly awakened Visions, they began to writhe in pain, as they felt their Vision throb and destroy them from the inside.

As they were about to be killed by the remaining Lawachurl, a mysterious man had suddenly appeared and fought it back and defeated it with ease. Glancing at the two children, he went over to their dying parents, who called out to their children in pain before asking for the man's assistance. In exchange for their Oaths to some mad god, he promised to help them out as the worried parents finally let go and passed on. The man did the same thing, asking the two of them for the cooperation and promise of Oath to the same being. Upon doing so, the throbbing finally stopped. The man, who named himself Yuè, had promised to train them and help them survive so that they could one day take back their freedom (and to continue his fight should he fail and fall to his demise)

Not really having anywhere to go now, Leon hesitantly agreed, finding comfort in the fact that the other child with him named Liqin is just as lost as he was. They followed Yuè back to Liyue, Leon bidding his old home of Mondstadt a small farewell as he left the wreckage behind. After being adopted by him, Yuè gives the two their new names, Yún and Skye, mostly to distance themselves from the traumatic night (and to distinguish their new roles from their old life). Thus, starts their journey as Seeker apprentices of the former generation's strongest Watcher.

"Time and time again, there's always something I had personally believed in: Misfortune occurs thrice, so a miracle pays the price. So many of us have different tragedies and stories to tell but I always hoped that through those misfortunes, a miracle will bloom and pay off."

Like his sister, Skye had not gained the ability to grasp his Vision-Gaze until his promotion later on. Though to some extent and thanks to Yuè's genius teachings and training, he had at least most of the theory and reflexes down that they would need later on. Moving while keeping their eyes perpetually shut (to avoid showing the Mad God, if it choses to look through them, anything interesting and forcing them to interfere), deflecting useless probing questions with simple words of politeness (as their Oaths would not allow them to divulge anything important anyway), even judgement of what to present to the Mad God as a temporary 'offering of entertainment' if they are in a pinch. Yuè drilled everything he had acquired from his years of experience onto the two. Skye did notice that their elder brother had been much more frantic and desperate at teaching them what they needed to but he attributed it to his usual frantic and strict ways.

Later on, upon the discovery of Barak's awful treatment and view towards Yún, Skye had nearly fought to the death for his sister's sake. Though the ex-Seeker Apprentice terrified him still, Skye had been ready to throw his own life upon seeing the broken look of his cheerful sister. Yuè had banished Barak as a result but it was a scar that had stayed in his mind for years, even after being separated due to him inheriting Mondstadt's Watcher status from the former Watcher.

Though he ended up living with the Ragnvindr's (mostly due to Yuè asking Crepus a favor) for majority of his return to Mondstadt, Yuè hadn't neglected his training. As a claymore user and his previous experience with Ame, Skye was taught Yuè's personal battle style (which later on, he incorporated his hydromancy from his Vision-Gaze too). In addition to that, he was also training with the likes of Diluc, Kaeya, and Xue, which is how he managed to be proficient in battle.

In one night, however, the Collective went into a chaotic state upon the mad god's announcement about Watcher Yuè's status as a traitor. Things went downhill immediately upon Skye feeling the Gaze land in his eyesight, ordering him to dispose of their traitor. The night he had slashed his claymore and saw his brother fall from the Peak, something had broken in him. Arriving back in Dawn Winery, he had been inconsolable for weeks until Xue had forcefull dragged him out to the rest. Slowly, he had healed from the incident as he was now Mondstadt's Watcher also looking after Liyue's newest Watcher.

Though things had calmed down for a while, Crepus' death had thrown another death for him to bear as he was forced to simply watch as another Seeker's life had been extinguished under the mad god's orders. Diluc and Kaeya's fight had driven a wedge between all four of the ones living in the household though fortunately, as with all things, time slowly mended and bridged the gap.

"My master once said my name is too big of a burden. From the Universe to simply the Moon, it was as if she had tasked me to keep a closer watch on you three. Now, I must do the opposite to you, Leon. From a lion to the vast Sky, please watch over your sister for me."

Diluc's arrival once again in Mondstadt a few years prior to the Traveler's own arrival had signified changes. There was a shift from their original relationships, growing older and wiser from experiences. Though Skye had managed to keep track of Diluc's progress (and in turn, had updated Kaeya and Xue on his journey) it was still rather different seeing someone in person than hearing reports from the Seekers looking after him. Upon Kaeya giving him the shared gift between all three of them, Skye knew that things were finally moving forward.

Upon hearing the catastrophe of his sister's entanglement with a Fatui Harbinger, Skye nearly packed up and walked straight into Liyue before she had told him to mind his own business. Much later on, he hears about the side-effect of Kaeya and Diluc's stunt had given the Fatui free-range in Mondstadt (even summoning La Signora's presence) due to Dvalin's havoc. Though it had caused much damage, it had also given Skye some much needed breathing room to continuously feed the Mad God with constant interesting scenarios. As the Veteran Adventurer, his job was originally to subjugate the Dragon but his gut instinct had told him to wait.

His neutral stance on much of the Fatui's schemes and actions had earned him interest from Signora (though he did reject most of her joking offers to join the Fatui) and much of Kaeya and Diluc's scrutiny (and jealousy). After the Traveler's encounter with her (and the events of A Watcher's Duty), Xue had given a hint and epiphany towards the squabbling red-head and cavalry captain about their shared feelings for Skye. Though very obvious to the Lieutenant, Skye had been blissfully unaware of their harboring feelings until a certain incident had triggered their protective streak which had led to all three consummating their newfound relationship.

Upon the Traveler's journey, this marks the start of the mad god's activity to increase as well, forcing the Watchers to finally fight head-on. Nothing is certain but one key fact is that Yún and the rest of the Watchers are at eye of the storm.