How is Elena a Petrova?

Elena Gilbert is a Petrova through her lineage, as she is a descendant of the original doppelgänger, Katerina Petrova. This connection grants her unique traits and makes her a target for supernatural beings, particularly vampires. Throughout "The Vampire Diaries," Elena’s heritage plays a crucial role in the series' plot, highlighting the significance of the Petrova bloodline and its ties to the doppelgänger mythos.