Star Wars Lore - Why Sith Have Red Lightsabers (Canon)
Malkavius for Darth Vader
Darth Vader formerly knows as Anakin Skywalker was the apprentice to Darth Sidious and was his enforcer. he served the will of the Emperor until 4 ABY when he betrayed his master and killed him on the 2nd Death Star in order to save his son.
Darth Vader should sound similar to James Earl Jones who voiced him in the movies, but anything near Matt Sloan who voiced Darth Vader in "Star Wars: The Force Unleashed", "Disney Infinity: 3.0", "Star Wars: Battlefront (2015)", and "Star Wars: Battlefront II (2017)" will be fine.
Example of James Earl Jones: https://www.youtube.com/watch?v=GueBXRYVhe0
Example of Matt Sloan: https://www.youtube.com/watch?v=2vhM1J1ZhAI
If you only knew the power of the dark side. Obi-Wan never told you what happened to your father. (for comparison)
No Master, the Jedi teachings on this subject were... Incomplete.
Yes. You could have given me anyone of those lightsabers to corrupt. Even Yoda's. But you did not.