What was your favorite episode Nina was in through Season 6? Comment and explain why. I'll go first: 4x23 (Season 4 finale) was my favorite because of the Katherine/Elena epic battle for death scene at the end. I can't imagine how hard it must be for Nina to play two characters with opposite personalities. Elena is so innocent and Katherine is so guilty. Nina did such an amazing job portraying and staying loyal to both Elena and Katherine's characters.