|“||You're surprised I came for you. You are my sister, Freya. And you are a part of this family -- always and forever.||”|
Klaus and Freya never met as children. Their parents, Mikael and Esther, left Europe after allegedly losing Freya to a plague. Niklaus was born in the New World, never knowing the sister he believed died in Europe.
Known only to Esther and Finn, their brother, Freya had not died but had been taken by Dahlia, Esther's sister, as part of a deal between the two to make Esther fertile. Freya was therefore raised by Dahlia.
While Freya was raised and used by Dahlia for her magic, suffering her abuse, Niklaus was raised by Mikael and was also abused by him. Klaus later claimed that both he and Freya at least both knew the suffering that came from being raised by an abusive parent.
Throughout The Originals Series
In For the Next Millennium, with six months following the demise of their aunt, it seems Klaus has accepted Freya as his sister. He is no longer hostile towards her, as they are able to have a peaceful conversation with each other. He even asked Freya to be Hope's mentor, as she would teach her niece about magic and prevent what was to follow with Hope's uncontrolled powers. Freya gladly accepted the offer.
In You Hung the Moon, Klaus asks Freya to perform a locator spell on Hayley, who is missing at the time. However, Freya is unable to track down Hayley due to Davina's cloaking spell. Elijah and Klaus later ask Freya to confirm a prophecy about the three remaining Original Vampires. As Freya was bleeding out the ear Klaus and Elijah looked worried about Freya. Although with certain difficulties, Freya does confirm Alexis' prophecy, and says they will all fall. One by friend, one by foe, and one by family.
In A Walk on the Wild Side, Klaus invites Freya to Lucien's apartment, due to Alexis being missing. Freya performs a successful locator spell on Alexis, who is at the Davilla Estate, albeit Klaus has a plan to infiltrate the oldest known society of vampires called the Strix. Klaus, Lucien and Freya crash the party pretending to be drunk. Freya uses this opportunity to slip away, find Alexis and bring her to the compound, which turns out to be even more difficult than she expected. Even though she had to use the show of force, Freya managed to subdue Alexis and take her to the compound, where she and Klaus witnessed the final display of the prophecy.
In Beautiful Mistake, Freya, along with Elijah, figures out the Strix are coming after Rebekah, and they do everything they can to protect her, while Klaus takes Aurora on a tour of the city. After learning Rebekah had been neutralized by Aya, Freya lets Klaus know she is unable to track their sister down.
In Out of the Easy, Klaus, Elijah and Freya, desperate in finding Rebekah, host a Thanksgiving party, inviting Lucien, Tristan and Aurora. After eating politely, things do not go as planned, leading the situation to turn into a raw fight between the hosts and guests. At the very end of the dinner, Klaus captures Tristan, thus making Aurora extremely angry and disappointed at him. Freya surprisingly asks Klaus not to simply let Aurora go, but Klaus ignores this as Aurora leaves the compound.
In Heart Shaped Box, Freya defends Klaus in an argument with Marcel. Klaus doesn't apprentice her effort, claiming he can defend himself, but what he can't do is cast a spell. Freya asks if he talks to his other sister the way he talks to her. Klaus gives her no answer and Freya storms out. Later at home, after Klaus saves Freya from being buried alive by Aurora, Freya walks in to see Klaus making another toy for Hope. After a moment of silence, Klaus informs Freya that he does consider her family, always and forever. Elijah joins in and the three share a drink.
In The Bloody Crown, Freya and Klaus with the rest of their siblings and family are forced to fight against Marcel and the rest of Klaus' former sireline. Marcel rounded them all and created a trail within the Mikaelson Compound and "justfully" condemned Klaus to suffer/slumbering with Papa Tunde's blade in his chest. Klaus sacrificed his life by doing this, but Freya also linked the rest of their siblings to Klaus' life and they all slumber until Klaus awakens and until Hayley finds a cure for all the dying members of the Mikaelson family.
In No Quarter,
Freya: "Before you dismiss me, you should know this-- if I've woken from my slumber, Dahlia has as well. Once she's sensed your child's magic, she will come for her. And she has the power to kill anyone who stands in her way... unless we kill her first."
Freya: "I don't want to kill you! I don't want to kill him! This is the family I longed for, but because of her-- (She looks back at Dahlia's body with loathing) -- I'll forever be alone."
Freya: "Nicely done. At this rate, you'll drive the entire family away."
Klaus: "Freya! It's about time you brought a gentleman home to meet the family. I'm Freya's brother. And you are? No, don't tell me. Let me guess-- Brad? Chad? Brody? Let's go with Brody. What are your intentions for my sister? Shall we discuss a dowry?"
Freya: "Not three months ago, you utterly despised me, and now you're playing the protective brother."
Klaus: "I just hadn't realized you were back from wherever it is you go to when you leave! Perhaps I was thrown off by the lack of strange gentleman callers perusing the contents of my refrigerator this morning!"
Freya: "Your concern for my whereabouts is touching."
Klaus: "I simply want to know who is here at any given moment! I hardly think that's too much to ask."
Freya: "What is it now, Niklaus?"
Klaus: "Really, Freya? Is that the way you greet the brother you've spent your entire life trying to find?"
Freya: "Oh, I'm sorry-- are you not calling for a favor?"
Klaus : "Freya, please. I am asking as your brother for your help."
Freya: "Fine. Text me the address."
- Physically speaking, Klaus and Freya look very much alike. They both have blond hair and blue eyes, a trait they have in common only with Rebekah. The other Mikaelson brothers all have dark hair and brown eyes.
- They both harbor negative feelings toward their mother.
- Both Klaus and Freya have children, and both lost their children in some way. Freya ingested poison in a suicide attempt and subsequently killed her son, not wanting him to endure the life she had. Klaus had to give away his daughter for half a year, in order to protect her.
- Both have killed Esther. Klaus in his rage after The Hybrid Curse was cast on him, and Freya killed her because she despises Esther for giving her to Dahlia.
- Freya thinks Klaus has questionable taste in women.
- In Save My Soul, Klaus broke Freya's neck to make sure that she is indestructible.
- In Exquisite Corpse, Klaus traps Freya with The Cursed Shackles.
- Both have killed their parents partly so they won't reveal a secret;
- Klaus murdered Ansel in Chasing the Devil’s Tail, to protect his secret about Hope, which Ansel knew about.
- Freya killed Esther in Exquisite Corpse, after she told her about her plans to turn the family against Klaus.
- Joseph Morgan said that Freya is the "female" version of Klaus.
- In Night Has A Thousand Eyes, it was shown that Klaus is fiercely jealous of their father's devotion to Freya because Mikael fought for Freya, and never fought for Klaus.
- They both had a closer relationship to Mikael than Esther, however Mikael and Klaus hated each other and Mikael and Freya loved each other.
- Klaus killed Mikael in front of Freya.
- In Ashes to Ashes, Freya tried kill Klaus, and she looked very sad when doing so and she said to Marcel that Klaus is her family and she didn't want to kill him.
- Klaus calls Freya "his sister" for the first time in Ashes to Ashes.
- In Ashes to Ashes, Freya goes to live with Klaus in The Abattoir.
- Klaus now trusts Freya and wants her, as well as Rebekah, to help him raise his daughter. However Rebekah leaves New Orleans to find a way to return Kol, and Freya stayed with Klaus.
- Both of their children had been wanted by their aunt Dahlia.
- Klaus is the only person, besides their aunt, who knows about Freya's son.
- Klaus was the first person, other than herself, to kill Freya.
- In Exquisite Corpse, Klaus brings her to their mother.
- Klaus lets her use him as an anchor to her power to help their sister.
- Klaus was the last of their siblings to accept Freya as his sister.
- Klaus and Freya's relationship more or less improved over the time skip, as the two are not as hostile with each other as they were before and Klaus can speak to Freya under more casual terms. However, Freya is stuck in the middle of the tension between Klaus and Elijah, thus needing to put her foot down and keep her brothers in line, especially because of Hope.
- Klaus scares the frat boy Freya brings home, showing brotherly care for her.
- Freya helps Klaus to locate Alexis.
- Freya goes to the Strix Gala in disguise with Klaus.
- In Heart Shaped Box, Freya commented about how Klaus would never speak to Rebekah the way he does her. In the same episode, it was Klaus who came looking for her as she laid in a coffin under the ground. Klaus reassured his older sister that despite his tendencies, he will always see Freya as family.
- Klaus has a tendency to be nagging and impatient with Freya whenever he seeks her magical expertise in dealing with their enemies. However, when Freya comes through for him, he isn't above showing his gratitude, no matter how subtle he can be.
- Freya and Elijah have been known to joke about Klaus's tendencies, even doing it together.
- Klaus's affection for Freya has grown to such an extent that he was visibly distraught at the sight of Freya's illusionary corpse and he asserted to his sister that he did not want her near him because of his afflictions. However, when Klaus was freed from the Hollow's hold, he made sure to remind Freya that her having a monopoly of power (because of her creation of a dagger that can kill Marcel) makes her a target.