He used his liquidized chamber to meditate to clear his mind and relax himself after too many claustrophobic hours in his suit. It's entirely possible that given his inability to sleep, let alone comfortably, Darth Vader's accumulated sleep deprivation turned him even more insane and unstable than he already was.
No. He takes it off in his pressurized meditation chamber, and according to the novelization of revenge of the Sith, he can go several days to weeks with no sleep and rely on mediation and the force to sustain him.
Let's not forget about the Bacta Tanks, which were where Darth Vader arguably had his most comfortable rest and meditation.
He doesn't bathe in the conventional sense, as he spends the majority of time in a Bacta Tank which affects his default body odor. And the fact that he has no sweat glands. Why does Darth Vader wear a cape? Vader's cape is actually an important part of his suit.
The armor encased Vader completely, creating a seal to protect his charred skin and lungs. It was also uncomfortable to wear.
Lord Vader was able to chew food, which he could consume while in his meditation chamber. While in the chamber, Vader could remove his helmet and consume regular food, which he preferred. Consuming food orally was the way he preferred eating.
If he were to take his mask off, the Sith Lord would soon suffocate. So it's the most crucial part of his armor. The only time he can breathe without the need for his mask is when he is in one of his meditation chambers seen in A New Hope.
Apparently, he had borderline personality disorder. As he came of age, Skywalker showed problems with impulsivity, violent outburst, illusions of invincibility and crises of identity, all of which are in line with borderline personality disorder diagnosis, the researchers concluded.
It appeared that Darth Vader was more machine than we thought. His armor could be hacked and controlled by a device. In a turn of events, Darth Vader's right limb holding his dangerous scarlet lightsaber was moving of its own accord toward his neck. This was a dangerous weakness indeed.
Dark Vader cannot breathe without his mask because his mask is connected to a life support system. His famous black armor suit covers this life-sustaining system.
Darth Vader's meditation chamber was a life support pod that allowed the Sith Lord to survive for extended periods without the helmet and mask of his suit.
Simply put, Vader's wounds were far too serious for bacta to heal entirely. If bacta were able to do that, then neither Anakin nor Luke would have prosthetic arms.
The main story of Vader Immortal only lasts about 30-45 minutes, depending on how quickly you move through it. After you complete the story, there is little reason to return to it other than to relive the same story again.
By far, Skywalker's most infamous use of it was upon learning of the death of his wife, Padmé Amidala, after his transformation into Darth Vader. This caused him to involuntarily unleash a powerful Force scream of shame, rage, and grief, severely damaging the medical chamber and the droids within it.
But he's a tad bit older - 44 years old, to be exact - when The Empire Strikes Back begins in 3 ABY ("After the Battle of Yavin"). And then Vader dies at the age of 45 in Return of the Jedi, which takes place one year later in 4 ABY.
Vader's suit sustained his life. But in the event of its malfunction or severe damage, he also could sustain himself with hatred and pain through the dark side of the Force. It's not a permanent solution, but he could and had done it.
The short answer is yes, without a doubt, Vader regretted becoming a cybernetic monstrosity. First, there's the constant pain and discomfort from his suit. Worse, however, is the psychological pain. Vader destroyed everything he had ever known for a chance to save Padme.
May 21, 2007 -- Anakin Skywalker, the Star Wars character who became Darth Vader, had borderline personality disorder, psychiatrists report.
1/15 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.
Appealing to the hate and conflict within him, Darth Sidious goaded Luke into attacking. Vader defended the Emperor and he and Luke were locked in mortal combat. Luke lost control of his anger, viciously attacking Vader, finally beating him down and chopping off his hand with his lightsaber.
"Nothing can stop that now. Just for once... let me... look on you with my own eyes." Darth Vader's last words before his unmasking, in reference to his death.
The Force choke is another tool employed by Sith to intimidate and even kill their opponents. Sith usually visualize the ability with a claw-like or crushing hand gesture, and strangle a victim through the power of the dark side. The result is an often painful, slow death.
Despite how integrated the suit appeared to be with regard to Vader's cybernetics, virtually all of the external components of the suit could be removed in their entirety, as Vader was known to routinely remove both the suit and his prosthetic limbs during maintenance sessions.