No sexual or romantic relationships whatsoever. In all documented canon sources, Vader's only relationships were with that of his inferiors and the Emperor, those being cordial and not of love or compassion. He only served the Empire to bring law and order to the galaxy by any means possible.
During the Imperial Era, a human female nurse served the Galactic Empire on board the Death Star under the supervision of a doctor. They both served the Sith Lord Darth Vader as his personal medical caretakers. The nurse became obsessed and psychotically in love with the Dark Lord of the Sith.
Padme and Luke were the obvious ones, but there was someone else Vader truly cared for. It was this guy: His name was Erv Lekauf. He was an Imperial Lieutenant who served as Vader's personal aid during the first few years of the Empire's reign.
Up to Star Wars: Episode VI - Return of the Jedi, Palpatine treats Vader poorly, and they very much have an abusive relationship. Darth Vader hates Palpatine yet is eager to please him, whereas Palpatine goes back and forth between acting as a friend and showing his hatred.
It's clear that Darth Vader wishes that Padmé joined him so that they could have remained together. But there are moments in Marvel's other Darth Vader series that suggest that, while the Sith Lord is very much still obsessed with the idea of Padmé, her betrayal may have caused him to think ill of his late wife.
It was the fact that Luke was his son that caused turmoil within Vader. It was his love for his son that caused his loyalty to Palpatine and the Dark Side to falter. If Vader didn't know who Luke was he would have been just another force sensitive person to be trained to serve Palpatine like an Inquisitor or be killed.
When Padmé and Anakin were captured on Geonosis, believing they were going to die, she confessed her romantic feelings to him. After this, they could not deny their romantic feelings for each other, so they secretly got married on Naboo.
Thus, he never had any romantic relationships again after Padme's death. Even if he wanted to, I highly doubt he could have after all the injuries he sustained on Mustafar, anyway. If this were real life, he would have died on Mustafar after Obi-Wan chopped off his limbs and left him to burn alive.
She finds it easy to accept Luke as her brother, but she is horrified by the idea Darth Vader was her father. Leia couldn't even understand why Luke accepted it so easily, and somehow believed there was good in their father.
By the events of Star Wars: Return of the Jedi, Luke had accepted that Vader is his father, and his hatred toward his father had completely disappeared, transformed into love and hope, like his late mother, Padmé Amidala, Luke believed there was still good left in Anakin and that he could be redeemed.
In Star Wars: Episode III – Revenge of the Sith (2005), Padme dies giving birth to twins, Luke and Leia. Luke is raised by Beru and Owen Lars on Tatooine. Leia is raised by Senator Bail Organa and Queen Breha Organa on Alderaan. Anakin, who has since become the Sith Lord Darth Vader, is unaware of his children's birth.
Darth Vader may have never known Princess Leia was his daughter in Star Wars and never cultivated a relationship with her, even when he was a Force ghost. Anakin Skywalker never knew Padmé was pregnant with twins, and he believed his child had died with his wife.
Summary. Darth Vader's failure to recognize Leia as his daughter in Star Wars: A New Hope stems from George Lucas's late decision to make Luke and Leia siblings. Leia's Force abilities and her lack of awareness of her true identity also contributed to Vader's inability to sense their familial connection.
Anakin does not have even the slightest bit of remorse. By the end, he feels nothing but anger. Although he feels regret for killing Padme, he still helps the evil Emperor. The film ends with Anakins standing side by side with the man on whose behalf he has committed all his crimes.
Anakin absolutely did regret many of his bad choices. After becoming Darth Vader, he pushed the regret down for awhile by dissociating himself from Anakin before the suit.
He understood he lost the ethereal battle before their physical fight even began. Thus, Palpatine never viewed Yoda as a major concern, even though the Jedi Master fought him to a de facto draw during the events of Revenge of the Sith.
if you mean: 'more evil,' then I would say Palpatine. He tortured a child who was trying to protect his father, and he didn't even blink in hesitation, in fact, he actually seemed to enjoy himself.
The novel explained that, had Vader killed Obi-Wan on Mustafar, he would have tried to kill Palpatine too, but given how badly wounded he was after the duel, his power wasn't the same and he was weak, both physically and mentally.
