In the original trilogy, Palpatine is depicted as the Emperor of the Galactic Empire and the master of Darth Vader (Anakin Skywalker).
Vader, the only power who overrules him is papa Palpatine.
1 Luke Skywalker
Having faced his father once before, Luke was familiar with his tactics and used the force to gain an upper-hand. In Star Wars Canon, only Luke Skywalker can be acknowledged as the one who truly defeated Darth Vader.
It's a very common misconception. Darth Vader's “official” position was that of Imperial Enforcer. In terms of rank, practically everyone outranked him. However, his position came with a number of perks that allowed him to operate both within and outside of the Empire's regulations or militaristic chain of command.
Vader was outside the Imperial Chain of Command and reported directly to Emperor Palpatine. However, as he was bound to do his Master's bidding, and sometimes screwed up, Palpatine would occasionally have Darth Vader serve others, which reinforced Vader's feelings of inferiority towards his Master, humiliated him, etc.
Kylo Ren, born Ben Solo, is the secondary antagonist of the Star Wars sequel trilogy. He is the dark, powerful, and extremely wrathful master of the Knights of Ren, as well as the apprentice of Supreme Leader Snoke, before killing him and becoming the new Supreme Leader of the First Order.
An intimidating mix of machine and man, Admiral Karius serves as Darth Vader's second-in-command on Mustafar. Stern and unforgiving, he intends to see to it personally that the captain of the Windfall doesn't survive their stay at Fortress Vader.
This might be a bit of a controversial pick at just number three, but Darth Vader, perhaps the best-known Dark Side user, is not the most powerful Sith ever. Born Anakin Skywalker, Vader became an extremely powerful Jedi Knight, one who was prophesized to be the "Chosen One" who would bring balance to the Force.
Depends on the Jedi. Top-tier Jedi and some Jedi with specific advantages against Vader (OT Luke, Obi-Wan) could beat him by themselves. Some of the more powerful councilors could take him in groups of 2–4.
11 David Prowse
The very first actor to suit up as Darth Vader and make an appearance on the big screen was bodybuilder David Prowse.
Yoda will most likely win in a fight against Darth Vader because he is more skilled with a lightsaber and has the experience and feats that allow him to trim whatever size and strength advantage Darth Vader has over him. In fact, Yoda nearly defeated Palpatine, something that Vader could never do.
We would have to give the victory to Darth Vader. While the two dark lords seem perfectly matched on their villainy and power, Darth Vader's lightsaber and ability to immediately use the force to choke Voldemort, without chanting any spell would end this showdown in seconds.
During the early days of the Clone Wars, Skywalker served as a Jedi General in the Grand Army of the Republic, commanding the clone troopers of the elite 501st Legion against the Confederacy of Independent Systems. After receiving his knighthood, Skywalker oversaw the Jedi training of his own apprentice, Ahsoka Tano.
Throughout the sequel trilogy, Kylo Ren serves as the master of the Knights of Ren, a warlord of the First Order, and both an adversary of and romantic interest for Rey.
The highest rank in the Imperial Military was Military Executor/Supreme Commander, Grand General in the Imperial Army, and Grand Admiral in the Imperial Navy. Malcor Brashin was a notable Imperial Grand General and Mitth'raw'nuruodo (Thrawn), Gilad Pellaeon and Morlish Veed are examples of famous Grand Admirals.
Within the Star Wars Legends continuity, Yoda's Jedi instructor was N'Kata Del Gormo, a Hysalrian Jedi Master, according to an in-universe legend.
Anakin Skywalker could have thwarted Darth Sidious and in fact did, albeit almost 25 years after he was given the initial opportunity. Anakin fell into Sidious' trap and attacked Windu, as Sidious played victim, only to then spring to life and fire lightning upon Windu.
While Obi-Wan Kenobi was frail by the time of Star Wars: A New Hope, he was still stronger with the Force than Darth Vader. The duel between Obi-Wan Kenobi and Darth Vader in Star Wars: A New Hope looks dated by today's standards.
As the first Dark Lord of the Sith, Ajunta Pall founded the first Sith Empire and expanded it onto other worlds. The Sith took over the planet Ziost and created it as their capital and as Pall's new home.
R2-D2 was present when Padmé gave birth to Leia and Luke, so he knew Luke was Anakin's son – but what he didn't know was that Anakin became Darth Vader. In addition to that, Anakin's fall was surely a painful event in R2-D2's life, one that he definitely wouldn't like to remember or even talk about.
During the early stages of the Galactic Empire's reign, the Imperial officer colonel Barokki and another officer within the Imperial Officer Corps instigated two assassination attempts on the newly-christened Sith Lord Darth Vader.
Stormtroopers are elite shock troops fanatically loyal to the Empire and impossible to sway from the Imperial cause. They wear imposing white armor, which offers a wide range of survival equipment and temperature controls to allow the soldiers to survive in almost any environment.