Elena Gilbert is a pretty girl. She's Stefan's ex-girlfriend, and she doesn't realize that she loves Damon back. She and Damon are best friends. Elena used to hate Damon, but now she would die for him. She's sweet, caring, protective, empathetic, and, most importantly, she can be tough when she needs to be. She's human, and she's Katherine Pierce, AKA Katerina Petrova's doppelgänger.