This means that Vader has multiple suits. He just chooses not to change it, because doing so might remove Vader from his private cloister of brooding and meditation. This connection to the Dark Side, and not the physical armor he wears, makes Vader one of the most dangerous threats in the galaxy.
These are the tragic and sad reasons that Darth Vader didn't upgrade his suit ever, even after being offered one by Palpatine (Darth Sidious). Anakin Skywalker was still somwhere inside that metal suit.
So Palpatine may have been trying to accelerate Vader's dark side training by giving him more pain to fuel his power. And if it also prevented his apprentice from challenging him, all the better.
The short answer is yes, without a doubt, Vader regretted becoming a cybernetic monstrosity.
Before canon it was stated in "Legends". That he was in constant pain, the suit was uncomfortable and purposefully so, since Palpatine never wanted Vader to reach his full potential.
He can only breathe without the need for his mask when he is in one of his meditation chambers seen in The Empire Strikes Back.
Darth Vader's armor, also known as Darth Vader's suit, was a suit of armor worn by the cyborg Sith Lord Darth Vader. Designed with life support technology, the armor ensured Vader's survival following the lightsaber and burn injuries that he sustained in a duel with Jedi Master Obi-Wan Kenobi on Mustafar.
It's not shown, but it is clearly insinuated that Anakin killed the younglings. This is confirmed later in the movie when Obi-Wan informs Padme that Anakin killed them. Both are torn apart with hurt and confusion, trying to make sense of something so terrible. How could Anakin do such a thing?
Giving in to his feelings, Anakin cuts off Mace Windu's hand, giving Palpatine the opportunity to kill him. Anakin regrets this almost instantly, but the thought of Padme was stronger than his remorse This is the moment Anakin officially became Darth Vader and led to serious issues in the Skywalker Saga.
Yes, when Darth Vader turned back to Anakin Skywalker and sacrifice himself to save his son, he dies and Obi-Wan uses the force to connect with Anakin's spirit. In that time Anakin apologizes to Obi-Wan, desperately asking him to forgive him for everything he has done to him and everybody over the years.
Lucas once said that following the duel on Mustafar, Vader's abilities were curbed due to all the injuries, and so became less powerful than the Emperor – and before the duel, Vader had the potential to become twice as good as his Sith master.
Despite his somewhat pure origins as a Jedi, Darth Vader definitely has plenty of moments where he genuinely enjoys what he does on the dark side.
With Luke, then, Palpatine saw a second chance. Despite having been beaten by Vader in battle, Luke was still young and, minus a hand, mostly organic. This meant he was incredibly strong in the Force and had all the qualities and raw power that Palpatine still desired.
Weakness: Electricity
It took a single-minded desire to inflict pain upon another individual to transform the Force into such a destructive weapon. Darth Vader possessed the skill to use Force lightning, but the limitations of his suit prevented this.
Since Anakin and Obi-Wan's battle on Mustafar, Vader has become an extremely powerful Sith Lord and, though his powers have increased, he is no longer as agile as he once was. Missing his limbs, Vader can only move as much as his suit permits.
Yes, his entire character since then was a self loathing tragic monster who has little reason to care about anything. Betraying Mace Windu instantly made him regret his act of impulse, Padme's death and rejection of his actions later on made it stick.
The maverick Jedi Master Qui-Gon Jinn comes before the Jedi High Council, which Windu is a member of, and offers to train Anakin Skywalker, believing that the boy is the Chosen One of Jedi prophecy. Windu and the other Council members decline, deeming Anakin too old and full of fear.
There are plenty of moments throughout the franchise where it is clear to see that Darth Vader still has some good in him. However, that full turn back to being a hero doesn't take place until he picks up Emperor Palpatine and throws him down the reactor core shaft.
“The tear [on Anakin's face] says that he knows what he's done, but he has now committed himself to a path that he may not agree with… but he is going to go on anyway. It's the one moment that says he's self-aware that he's rationalizing all his behavior.
The story is Anakin was manipulated to the dark side by Palpatine based on fears of losing Padme and appeals to his desire power and agency, over his life and the galaxy as a whole.
In Star Wars canon, there are currently only four younglings that are known to have survived the infamous Order 66 and Darth Vader's slaughter, while in Legends, there are 20 known survivors.
Anakin would have likely been killed by the clone troopers, along with the other Jedi. However, perhaps he would have escaped. He would have taken the pregnant Padme with him. He would have needed to get as far away from the eventual Empire as possible, so perhaps they would have gone with Yoda to Dagobah?
He tracked Jedi Master Kirak Infil'a to the river moon of Al'doleem and confronted him. Vader eventually killed the Jedi Master and retrieved his curved-hilt lightsaber.