Nina Dobrev Universe

Bonnie Bennett

Main article: Elena and Bonnie

Elena and Bonnie have been friends from since childhood. Bonnie has said that she "loves Elena like a sister" and has said that she would "die for her". They are very close and would do anything for each other. Since Bonnie's Grams died, she has alienated Elena for her relationships with Stefan and Damon.

Bonnie told Elena that she likes Jeremy and Elena approved. When Bonnie has enough power to kill Klaus, she helps protect Elena. Although when Elena finds out that Bonnie will have to die to kill Klaus, she tries to stop her. But she thinks it's too late as Bonnie fakes her death. They later say sorry to each other over a webcam as Bonnie is in a safe house.

Jeremy Gilbert

Main article: Elena and Jeremy

Elena has always protected Jeremy. She even asked Damon to take away his suffering (by compelling him) so he wouldn't remember anything aboutVicki's death. He also blamed Elena for taking away his memories and says that it wasn't her call to make. He is only Elena's adoptive brother but it is found out that he is in fact her biological cousin. At the beginning of Season 2, Damon snaps Jeremy's neck after Elena snaps him emotionally, leaving Elena horrified and his friendship with her shattered. Though Jeremy came back to life as he was wearing the Gilbert Ring at the time of his "death". Elena continues to be cold to Damon throughout the season because of what he did to Jeremy though she eventually warms up to him. Elena loves Jeremy very much and goes to great lengths to protect him, even refusing his ring when she was linked to Katherine at the Masquerade Ball while the Salvatore Brothers were attacking Katherine, stating "No Jeremy, what I need is for you to be safe".

With Jeremy in on the secret of the supernatural happenings in Mystic Falls, Elena begins to confide him and Jeremy is in on helping keep Elena safe from Klaus. Jeremy let Bonnie use his blood since he is blood related to Elena after Elena is kidnapped by Rose and Trevor for a Locator Spell to find out where Elena is so Stefan and Damon can go rescue her and is greatly relieved when his sister returns home unharmed, giving her a warm embrace.

Katherine Pierce

Main article: Katherine and Elena

Elena is the doppelgänger of Katherine Pierce, and Katherine is Elena's ancestor. They look alike because they are both Petrova doppelgängers. When Rose informs Elena about Klaus, Elena goes to see Katherine in the tomb, who had been imprisoned by the Salvatore Brothers. Katherine explains to Elena that she had a child in Bulgaria before she was transformed into a vampire, but her father sent the child away and she never saw the child again, thus continuing the Petrova bloodline.

At first, Elena was oblivious to the fact that she looked exactly like Katherine but discovered a picture of Katherine in 1864 in Stefan's bedroom and was shocked by their resemblance to each other. Stefan later explained to Elena that she was adopted by her parents, meaning Elena and Katherine were probably related somehow. At the end of Season One, after John Gilbert kills all the tomb vampires, Katherine returns to Mystic Falls and poses as Elena. Damon kisses Katherine, believing she is Elena then Katherine is invited into Elena's house by Jenna. Katherine then attacks John Gilbert and stabs him just as the real Elena arrives home. Elena

hears a noise in the kitchen and goes to investigate. She and Katherine do not meet at that particular instance but Katherine speeds around Elena's house, terrifying Elena. Elena and Katherine meet after Stefan tortures Katherine for information about her being in Mystic Falls. Katherine says she is back in Mystic Falls because she loves Stefan and wants to be with him and threatens Elena's loved ones if Elena doesn't break it off with Stefan. Elena and Stefan pretend to break up but Katherine is not fooled and compels Jenna to stab herself, causing Elena to break up with Stefan for real. After Katherine is imprisoned in the tomb, Elena goes to her for information about her past with Klaus and Katherine reveals that she and Elena are Petrova doppelgängers and in 1492, Klaus wanted to sacrifice Katherine to break the sun and moon curse but Katherine escaped and became a vampire. Katherine says Klaus will want to sacrifice Elena now, as she is a human Petrova doppelgänger and if she runs, he will kill everyone she loves, just like he did to Katherine's family in 1492. After Elena kills Elijah, Katherine is released from his compulsion and goes to the Salvatore House, telling Damon she wants to help them protect Elena. Even though Katherine kills Jonas, saving Elena's life, Elena still thinks the worst of Katherine, and it's unlikely her opinion of her will change any time soon.

Caroline Forbes

Main article: Caroline and Elena

Elena and Caroline have been friends since childhood though Caroline is jealous of Elena and finds herself in competition with Elena for boys' affections. This is especially evident when Caroline takes an interest in Matt Donovan, Elena's ex-boyfriend who is not completely over Elena despite Elena being in a relationship with Stefan. Matt and Caroline begin to date though Caroline occasionally gets irritated by Matt and Elena's history and their present friendship. After Caroline is turned into a vampire by Elena's doppelgänger, Katherine Pierce, Elena supports Caroline through the first few weeks and helps her control her bloodlust. When Katherine threatens Matt, Caroline is forced to help Katherine break up Stefan and Elena, though Caroline eventually reveals this to Elena and Elena forgives her for it. Given she wasn't doing it voluntarily and was just trying to protect the man she loved. Elena and Caroline have since become much closer friends, with Caroline helping keep Elena safe from Klaus and keeping Elena's whereabouts a secret from Stefan upon Elena's request while Elena is down in the tomb talking to Katherine about Klaus.

Jenna Sommers

Main article: Elena and Jenna

Elena and Jenna are very close to be just aunt and niece, but Jenna treats Elena as if she is one of her own. Elena keeps secrets from Jenna though, even Jenna has kept the secret that Elena was adopted. But since then their relationship is growing stronger, thus there is now a strain, due to Jenna thinking that Elena is the one who kissed Damon, though in reality it was Katherine. In Plan B, she was compelled by Katherine to stab herself and this lead to Elena breaking up with Stefan, as she feared for Jenna's safety as well as the rest of her friends and family. She is later seen in By the Light of the Moon, inviting Elijah into her home; unaware of him being a vampire. During the last episodes of season two, Jenna discovers the supernatural world and Elena tells everything. After the return of Alaric, Jenna feels much better knowing the truth and wanted to get ahead with Elena, Jeremy, and Alaric, unfortunately, Klaus turns into a vampire, and is staked her to comply with the sacrifice. Elena is shocked to learn that her family is dead because of her, but Jeremy says he still has her.

Elijah

Main article: Elena and Elijah

After stabbing Elijah with a dagger covered with white oak ash, Damon Salvatore and Stefan Salvatore kept him in their basement to keep an eye on him, making sure that no one would remove the dagger (removing the dagger brings originals back to life). Elena a few episodes later in season 2 removes the dagger from his body in attempt to get some questions from him about the sun and the moon curse and also questions about Klaus. Elena eventually trusts Elijah and Elijah eventually trusts Elena. Damon Salvatore and Stefan Salvatore are still speculating whether Elijah is telling the truth or not. Elijah believes there is a way to save Elena from Klaus's curse with his Elixir which was meant to be for Katherine Pierce 500 years ago.