Tarkin. And Leia was also in Rogue One. There's also Palpatine who was not originally played by Ian McDiarmid in Empire Strikes Back. Same as Boba Fett who was only recently in the past 20 some-odd years re-voiced by Temeura Morrison for the originals. Good quiz besides that!
Thanks for the feedback. I was expecting it to contain at least a couple mistakes. I'm gonna leave Palpatine out because the 2004 release had Ian McDiarmid replace Marjorie Eaton. Boba Fett never showed his face in the originals so I won't include that. And I will add Tarkin because I didn't realise he was in the prequels.