Make sure you include set pieces and lines that explain how Vader takes care of his "personal business," i.e. use the potty, blow his nose, scratch that annoying itch that's juuuuust out of reach, etc. Include an easy chair on the bridge because he has to get tired from all that standing and he only seems to sit in his TIE or his Imperial Officer Intimidation Sphere. Maybe even show a bed and some nose drops in his chamber. And he has to get bored from all that standing and sitting around for lengthy periods of time: maybe he has some video games that play inside his helmet and respond to his brain waves, like Mario Bros. or Sonic the Hedgehog.