Palpatine punished Darth Vader for various failures and acts of insubordination, primarily failing to defeat Luke Skywalker, destroying the Death Star, and generally displaying a lack of control or strength, which made him less useful as an apprentice and revealed Palpatine's manipulation, with punishments ranging from psychological torture to physical mutilation (in Legends) and severe Force lightning, all to keep Vader subservient and remind him of his weakness.
Palpatine wanted the ultimate apprentice and Vader had the ability to be the strongest force user in history. After losing that strength, the Emperor considered Vader to be nothing more than Maul or Dooku; a pawn to be used until he found a suitable replacement (Starkiller or Luke for instance).
We've seen time and time again that Palpatine treats post-ROTS Vader like a servant, and doesn't have much respect for him. He constantly punishes and abuses Vader, and doesn't seem to have any of the kindness that he displayed before he got put in the suit.
Palpatine deliberately made the suit a painful fit, so that Vader could harness his anger and hate more efficiently and channel it so that he was almost invincible in his aura of intense rage. Vader would find spare time to relieve himself of his suit, and meditate in his special chamber or in a bacta tank.
Darth Maul is the weakest. Bane was strong : he killed all the Sith and lots of Jedi.
Surprisingly, Vader had no idea that Leia was, in fact, his daughter. Despite his interrogation of Leia, the Sith Lord still hadn't discovered that he was related to the princess. In contrast, Vader sensed his connection to Luke Skywalker almost immediately.
In canon it was Kirak Infil'a , Cere Junda, Obi-Wan and Lord Momin . All messed him up quite badly with Kirak winning round 1 but losing round 2 and Momin cutting off his arm. Obi-Wan actually beat Vader. In Legends it was Shaa Koon, An'ya Kuro, a clone of Maul and Galen Marek.
Palpatines end goal was "power, unlimited power" and to be the eternal god king of all reality. He wanted dominion for the sake of dominion and to have the reach and ability to destroy any opposition to his rule, notably force users.
In Legends he had some consorts over the years, but he never had anyone that was an actual love interest. The latter at least also holds true for canon material, although we haven't seen any of the former.
Hamill famously objected to certain creative decisions in the film, namely the revelation that Luke Skywalker essentially quit the rebellion after a painful failure and had spent years living a hermit-like existence by himself. “I said to Rian, 'Jedis don't give up.
After Anakin calmed down he realised what he done, and that Palpatine tricked him by convincing him to look for answers in the dark side, but in the end he found the only person he had left in his life was Palpatine, and the only thing he had left to live for was satisfying his desire for power, which was best ...
Vader's betrayal cut deep, as he had been responsible for the destruction of her home planet, Alderaan, and the deaths of countless innocent people, including her adoptive parents. The revelation that Vader was her father must have been utterly shattering for Leia.
Ever since Return of the Jedi, Star Wars has reframed Luke and Leia's kiss as lacking real romantic intent - something Leia did solely to get a rise out of her real love interest, Han Solo.
According to wookieepedia , special contingency order 37 was: Capture of a single wanted individual through the mass arrest and threatened execution of a civilian population . Follow-up directives include scenarios for body disposal of civilian casualties and suppression of communications.
Revenge of the Sith
Palpatine explains that Plagueis was so powerful and wise, he had mastered the dark side of the Force to such an extent that he could cheat death (mostly saving people he cared about from death) and create life; unnatural abilities which are unknown to the Jedi.
Qimir has already been calling himself Darth Venamis, and is ready to officially be a Sith Lord Apprentice, but, is also already conspiring to get a pupil of his own, & eventually kill his own master as well.
Matthew J Meyer George Lucas has stated: "Anakin Skywalker was conceived by the midi-chlorians, but it was Palpatine who manipulated the midi-chlorians to create Anakin" (Source: "Star Wars: Episode III - Revenge of the Sith" DVD commentary, 2005).