Star Wars Darth Revan Prodigal Knight.
Morgoth by SpartanK42.deviantart.com on @deviantART
“Early sketch of "Jedi Killer" aka Kylo Ren by Christian Alzmann. ------ I liked how they were trying to incorporate more Vader into his initial designs.…”
The Concept Art Library
In Star Wars: Knights of the Old Republic II: The Sith Lords, G0-T0 states that he changed his droid shell into something more intimidating. Description from deadlystream.com. I searched for this on bing.com/images
Darth Vader redesign by JoseArias on DeviantArt
Lord Vader by MrTomLong.deviantart.com on @DeviantArt