Another Doppelgänger?

"Humanity is our greatest weakness. No matter how easy it is to turn it off, it keeps trying to fight it's way back in -Sometimes I let it."

"Why?"

"Because it gives me the strength to outrun my enemies, the will power to leave Stefan the moment I wanted to stay to help him and Damon in their transition and spend eternity with them when I know if I stay they'll be in danger or die."

"Your a heartless bitch Katherine that's why you've got no one left!"

"Only being heartless will allow me to protect her."

Katherine Pierce or Katerina Petrova is a vampire with a penchant for revenge and a desire for attaining justice. She's depicted to be a woman who's smart, cautious, calculated and very manipulative but what they didn't know was the reason she did all this was to keep her safe. The only one she could rely on that needed her the most.

Her identical twin sister Cassiopeia Petrova