Short answers, pulled from the story.
David Prowse, a bodybuilder and actor standing six feet six inches tall, wore the Darth Vader suit in the original trilogy. Bob Anderson, a former Olympic fencer, performed Vader's lightsaber fight scenes in The Empire Strikes Back and Return of the Jedi. James Earl Jones provided the voice in all films.
Lucas dropped the surname "Starkiller" a few months into filming because he felt it had unpleasant connotations linked to Charles Manson, who became known as a "star killer" in 1969 after murdering the actress Sharon Tate. He replaced it with "Skywalker."
Concept artist Ralph McQuarrie created the design by combining a full-face breathing mask with a samurai helmet, at George Lucas's request for a figure that felt like it came in on the wind. The prop sculptor Brian Muir built the physical helmet and armor.
Jones retired from voicing Darth Vader in September 2022. The company Respeecher digitally recreated his voice for the series Obi-Wan Kenobi, and Jones later signed over the rights to his voice for future Star Wars productions.
In France, Vader's name was changed to Dark Vador starting with the original 1977 film, and he is still referred to that way in recent French-language Star Wars media. In Italian editions beginning with the original trilogy, he was called Dart Fener; that name was chosen by Italian fans in a 2004 public vote for Revenge of the Sith but was switched to "Darth Vader" for The Force Awakens in 2015.
In 2003, the American Film Institute ranked Darth Vader third on its 100 Years...100 Heroes and Villains list, behind Hannibal Lecter in first place and Norman Bates in second.