His strength in the Force made him a prime target for Snoke, who continuously infiltrated his mind and gave him feelings of doubt and resentment. While he didn't undergo formal Sith training, his entire life is filled with various initiations and Sith lessons.
Though initially trained as a Jedi by his uncle Luke Skywalker, Ben was seduced to the dark side of the Force by Supreme Leader Snoke, and aspires to be as powerful as his grandfather, the Sith Lord Darth Vader / Anakin Skywalker.
Darth is a title reserved for Lords of the Sith. Ben/Kylo was not a Sith. He was the leader of the Knights of Ren - hence the 'Ren' suffix. Darth is an honorific granted only to Dark Lords of the Sith.
Kylo Ren was always obsessed with his grandfather. He didn't learn he was the grandson of Darth Vader until he was a teenager, when a recording from Bail Organa - intended to be a private message for Leia - was shared with the entire galaxy.
In 28 ABY, a confrontation initiated by Skywalker resulted in Solo turning against the Jedi and falling to the dark side. Solo destroyed his master's training temple, killing his fellow students, then fled to join Snoke. He killed and replaced the leader of the Knights of Ren under a new persona, Kylo Ren.
Why did Kylo Ren Fall to the Dark Side? - Star Wars Theory [Jon Solo]
Did Kylo Ren regret killing Han Solo?
But this is actually a very sad reason because it actually had the opposite effect, and he deeply regretted his decision to kill his father and it haunted him for the rest of the trilogy. Also, Han was telling him that Snoke was using him, but one of the reasons he killed him was to impress Snoke.
Not only did Ben care little for the Jedi, he also viewed Luke as the person keeping him away from his parents. And the strict rules of the Order only made matters worse, as Ben felt they limited his potential, and forced him to forgo attachments.
Kylo Ren's obsession with Vader is clear, but Star Wars never explained how he acquired the helmet. It is speculated that he may have found it himself on Endor, or it could have been passed down to him by Supreme Leader Snoke.
He saw her as a useful tool for his rise to power. He was intrigued by the mystery surrounding her. He wanted closure for his defeat at her hands. He had a genuine emotional connection to her.
Had Lord Vader not succumbed to emotion at the crucial moment -- had the father killed the son -- the Empire would have prevailed." That means Kylo was aware of the redemption and frequently reminded of it. Kylo chose to idolize his grandfather for what he once was, viewing him as Darth Vader and not Anakin Skywalker.
The lightsaber's redesign was a byproduct of the bleeding process that damaged its kyber crystal, rendering it dangerously flawed and unstable, and necessitating the lateral vents were meant to prevent the cracked kyber crystal from overloading.
Kylo develops a close relationship with Rey and starts feeling genuine affection towards her, so when Snoke reveals that he had manipulated their bond and tortures her in front of Ren, he looks furious at his master. Thus, when Snoke orders Ren to kill Rey, he chooses to save her and kill his master instead.
Despite his origins, Snoke was not a Sith, but was used as a tool by them to groom and mold Ben Solo, the eventual Kylo Ren, into an heir worthy of Darth Vader's legacy, testing his capacity to inherit the Sith legacy as a whole and rule the galaxy as the new Emperor.
However, joining the Sith means declaring loyalty to the dark side, which Anakin did before his eyes turned yellow. This may explain why Kylo Ren, torn between the light and dark, didn't have yellow eyes in the Star Wars sequel trilogy, as killing his father split his spirit even more.
Although Solo was the last of the Skywalker bloodline, Rey assumed the name "Skywalker" to honor their memory, repudiating her own heritage as a Palpatine.
Why does Kylo Ren punch his blaster wound during his lightsaber duel with Finn? To generate pain and thus adrenaline. The Dark Side of the Force feeds off of such things; anger, pain, fear. Earlier in the movie we'd seen Chewie blast some poor Stormtrooper and send him flying despite his armor.
The Rise of Skywalker novelization insisted the kiss was not romantic, explaining that it was “a kiss of gratitude, acknowledgment of their connection, celebration that they'd found each other at last”, but when looking at the context and what their connection was like since The Last Jedi, the kiss between Rey and Ben ...
Kylo Ren's "unstable" lightsaber was designed to kill. Knowing Makashi, he would become a much more dangerous foe as he could disarm and eliminate his opponents far quicker without the need to endure a long, intense fight. Sadly, he didn't learn Form II as there was no one around to teach him during his younger days.
Summary. Rey gained knowledge and skills through her connection with Kylo Ren, allowing her to tap into his training and skills. Kylo Ren was wounded by Chewbacca's bowcaster, which he believed inhibited his ability to defeat Rey.
On Malachor, Ahsoka Tano damaged Vader's helmet and thereby learned the truth of her former mentor, Anakin Skywalker. Three years prior to the Battle of Yavin, Vader engaged in a duel against his former apprentice, Ahsoka Tano, inside the Malachor Sith temple.
After defeating Vader in a duel on Mustafar, Obi-Wan Kenobi took Anakin's lightsaber with him into exile on Tatooine. Obi-Wan gave the lightsaber to Anakin's son Luke, who used it in taking his first steps along the Jedi path. But Obi-Wan didn't tell Luke the terrible truth that his father had become Darth Vader.
Ren destroyed his helmet in a fit of rage after Snoke derided him as "a child in a mask." Ren struggled to control his anger as he left the throne room. However, once he was alone in a turbolift, cradling the helmet in his hands, Ren was overcome with unrestrained fury.
I suggest that when Ren's emotional outbursts, impulsivity, and unstable self-concept are looked at more closely, there is plenty of evidence to suggest that he suffers from Borderline Personality Disorder and that perhaps he is simply not just a cold-hearted villain after all.
Ben Solo is the love of Rey's life. Initially unknown to Rey, she forms a dyad in the Force with Ben. The dyad is an unbreakable Force-bond that makes them one in the Force, despite being born as two physically separated individuals.
This caused him to attempt to assassinate him in his sleep. Needless to say, Kylo Ren is almost definitely a significant threat. However, we cannot definitively say that he is more powerful than Luke. Kylo's powers are vast but they are still highly unbalanced and difficult to control.
