In Star Wars Legends and Canon, Galen Marek (Starkiller) is the only Jedi (other than Obi-Wan Kenobi) to put a beat down on Darth Vader/Anakin Skywalker.
Galen Marek, better known as Starkiller, was the main protagonist of the Legends games before Disney bought Lucasfilm. He displayed incredible control of the Force, from moving a Star Destroyer to defeating both Vader and Palpatine in succession.
Lord Starkiller is an antagonist in an alternate Star Wars timeline in which Darth Vader is defeated and killed by his former apprentice Galen Marek, code named Starkiller.
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Why Starkiller Was Able to DEFEAT Darth Vader - Star Wars Explained
Did Vader clone Starkiller?
After the death of Marek, the original Starkiller, Vader endeavored to create a more powerful and obedient version of his fallen disciple, using a cloning facility on the planet Kamino to carry out this agenda. However, the procedure was imperfect, resulting in a series of unstable clones that succumbed to madness.
While Vader had his weaknesses, including vulnerability to electricity, characters like Emperor Palpatine, Mace Windu, Yoda, and Obi-Wan Kenobi all had the potential to defeat him in battle.
As Darth Vader, he was one of the strongest beings in the entire galaxy. But even then, he was never able to surpass his master, Darth Sidious. A Sith Apprentice can only become the master when they murder the one who trained them.
However, Starkiller still managed to best Kenobi - defeating him in combat and causing his spirit to disappear with a blast of Force Lightning. Unable to battle Starkiller, Kenobi's spirit told Luke to run, with the Millennium Falcon fleeing Mos Eisley.
It is also outright stated that Sidious was feigning weakness to goad Starkiller into striking him down and to turn him to the Dark Side. He didn't beat Sidious. He even went oneness and then died to Sidious.
Darth Vader was Starkiller's master. He gave Starkiller tasks and missions to complete, and was hoping to use him to overthrow Darth Sidious and take over the Empire. But he was NOT Starkiller's friend or father figure. He was abusive, starving Starkiller and forcing him to fight when starved or...
He is pretty powerful, definitely up at an A tier level of ability. He has faced quite a few potent Jedi masters. If memory serves, the most powerful person he beat outright was Shaak Ti. He did technically beat Vader, but he used lightning and then damaged his suit with a hurled piece of debris that exploded.
Yep. Darth Maul didn't really say or show straight up that he "feared" Darth Vader, but he openly stated his belief that he could not defeat Darth Vader without the help of the Jedi, therefore on his own.
Starkiller shot Force Lightning at him and ended the fight as he threw his lightsaber at him, splitting Kylo Ren into two and launched his remains out of the base.
Darth Vader defeats Darth Maul. The two Sith Lords engaged in a lightsaber duel, going through the volcano and onto a bridge situated over a river of lava, which collapsed, though they both survived and continued their battle.
The only Sith Lord who actually killed Vader, Darth Sidious kept his apprentice in line for over two decades. His true advantage was Force lightning, a power which would wreak havoc on the suit keeping him alive.
This isn't a fight, this is a curb-stomp. Kylo would absolutely never decline a fight with Darth Vader, a force of legendary power whose surpassing will certianly gain him a place among the most powerful of the Dark Side, but he is clearly outmatched in power.
Given the years between these comics' publications, it's hard to tell if Gillen built this argument intentionally or not. Regardless, the core concept is still true. Thanos wields more power and authority than Darth Vader, existing as a stronger and more capable villain overall.
Vader Outranked only by Sidious - CON: The only thing I can find that says Tarkin outranked Vader is a quote by David Filoni in 2015 during an interview about Rebels. He actually says that Tarkin outranks Vader.
But unknown to Starkiller, the Emperor's spies had been following him since Raxus Prime, tracing him back to Vader's flagship. Vader, faced with certain death for his "betrayal," in turn betrayed his shocked apprentice by impaling him through the chest with his lightsaber.
Galen Marek, Codename Starkiller, was killed in the “canon” ending to the Force Unleashed videogames when he sacrificed his life to save the founders of the Rebellion and his love Juno Eclipse. After his death Vader and the Emperor started a project on Kamino to clone him.
It's a pretty well known piece of “Star Wars” lore, but Luke's original name was Luke Starkiller. Lucas changed it because he thought Starkiller sounded a little too aggressive, specifically reminding him of Charles Manson, so he changed the name to Skywalker.
