Star Wars it's packed with characters who can make incredible use of the Force. However, it is quite difficult to catalog the power of each of them. If we stick only to the canon, these are the 5 most powerful characters of the star wars universe:
Emperor Palpatine/Darth Sidious
Palpatine is one of those characters that follows wreaking havoc even after death. Because... whether we like the last trilogy of the saga or not, the truth is that the emperor had not said the last word until then.
Palpatine's main victim is his own master, Darth Plagueis. He drops it himself at the opera while he draws Anakin to the Dark Side. Shortly after, revealing his true face, Darth Sidious would finish off three Jedi masters in one sitting. He also demonstrated his power by shooting lightning with his hands, as well as his lightsaber prowess.
Objectively speaking, Palpatine is much more powerful than darth vader. In fact, according to George Lucas himself, Vader could never be stronger than Palpatine because of his amputations. This does not mean that, in a moment of weakness, Vader finished him off. We could say that he made the same mistake as his teacher.
Luke Skywalker
Despite not having had Force training at as young an age as his father, Luke did show in the original trilogy having a Power greater than Darth Vader. First, because he manages to avoid falling to the Dark Side. And on the other, because he not only manages to defeat him, but also convinces him to come out of the dark.
In the modern trilogy, Luke's powers are in another dimension. He can even fight on one front, while being thousands of light-years away, on a different planet. Part of his power ends up developing the moment he dies, when he becomes a Force spirit.
Yoda
This adorable old man not only had impressive abilities with the force, but he also knew how to harness it to train generations and generations of new Jedi.
In Episode III, Yoda is the first to go after Palpatine to stop him. In fact, his wisdom is more than enough to read all the future emperor's plans. Yoda even refers to him at the time as Darth Sidious.
Although Yoda was not in a formidable physical form at the time, the great master faces the Sith and does not make it easy for him. The confrontation ends in a draw: Palpatine disappears and Yoda enters through the electricity conduits to warn the rest of the Jedi.
Tenebrae / Darth Vitiate
He had mastered the Force since he was a child. In fact, to him, it was like a toy. At ten years old, he was able seize the power of the Force from his own father. Once turned into Darth Tenebrae, this Sith could use others as if they were puppets. For that reason, he bequeathed to become a Sith Emperor of the Old Republic.
The father
This character was developed in depth in Star Wars: The Clone Wars. She was a descendant of the Celestials, and her mission was balance the Light Side and the Dark Side of the Force.
The Father can freely teleport around the galaxy. He can strip his children of his bodies, erase memories, and even stop a lightsaber with his bare hands.