Sif est un personnage de fiction, déesse appartenant à l'univers de Marvel Comics. Créée par le scénariste Stan Lee et le dessinateur Jack Kirby, elle est apparue pour la première fois dans le comic book Journey into Mystery #102 en mars 1964. Le personnage est inspirée de la déesse scandinave Sif dans la mythologie nordique.

En 2012, Sif devient l'héroïne principale de Journey into Mystery dans le numéro 646, lorsque la scénariste Kathryn Immonen et le dessinateur Valerio Schiti commencent à travailler sur cette série.

Biographie

Early life
Sif, Heimdall's sister, has been Thor and Balder's constant companion since childhood. Like most Asgardians, Sif was born with golden hair. Hers was turned black after Loki cut it and replaced it with enchanted hair made by dwarves. At an early age she showed great prowess as a warrior and was considered the best female warrior in all of Asgard, matched only by Brunnhilde. At one point a giant gave her to the death goddess Hela in exchange for immortality, but Thor saved her by offering himself in her place. Hela was so impressed that she let them both go.


Life as a warrior
Sif and Thor are separated when his father Odin banishes Thor from Asgard and Thor begins a life as a superhero on Earth. Many years later Thor becomes romantically involved with Jane Foster. Thor brings Jane to Asgard to be wed, and she is granted immortality but fails a final test. Odin sends her back to Earth, stripped of her newly acquired powers and without memories of the event. Odin then arranges an encounter with Sif while Thor is battling the monstrous super-strong Unknown, and the two fall in love again.

Reunited with Thor, Sif accompanies him into battle against many of his most formidable enemies including Ulik, the Enchanters Three, the Circus of Crime, Wrecker, Mangog, Pluto, and Surtur. Sif is part of the resistance when Loki takes control of Asgard. After Hogun the Grim attempts a physical attack, Sif puts herself in the line of fire and convinces Loki if he dies, he would have to kill her too. Loki declines to murder anyone at that point. Sif is one of the Asgardians who encounter Tana Nile, leading to a series of adventures with her that gets them exiled from Asgard for a time, but they eventually return home. Sif discovers that Thor still has feelings for Jane Foster when she finds him at her hospital bedside after Jane has been critically injured. Despite this, Sif chooses to save Jane's life by merging her life force with her own. Sif does this partially to try to understand Thor's attraction to mortals, especially Jane. Sif is soon separated from Jane, and Jane is exiled to a pocket dimension only accessible through the Possessor's runestaff. Eventually, Sif and Thor rescue Jane and reunite her with her mortal love, Dr. Kevin Kincaid. Red Norvell, who is attracted to Sif, kidnaps her when he gains Thor's power (thanks to Loki). She convinces him to return and save Asgard from Ragnarök. Later, she breaks a deadlock of votes, allowing Thor to return to Earth.

Later the alien warrior Beta Ray Bill comes to the defense of Earth during a war with Surtur and his demon army. In the midst of battle Sif and Bill find themselves attracted to each other. Meanwhile Lorelei has given Thor an elixir that causes him to fall in love with her, and he is so blinded by the spell that he strikes Sif in anger. When the war is over, Sif and Bill spend some time on Earth exploring their mutual attraction before returning to Asgard. Sif eventually returns and finally comes to forgive Thor, after she realizes that Lorelei was to blame for his brutality. However, she clarifies to Balder that her love for Bill is purely platonic.

She also develops a romantic relationship with another mortal to wield Thor's power, Eric Masterson. Despite this, Sif risks her life to travel to the realm of Mephisto to free what seems to be the soul of Thor from a mystical bag, pledging her loyalty to the demonic entity. She is manipulated into a new costume change and is sent to face down Eric and Balder in battle, who had willingly followed her, worried for the success of her mission. Eric and Sif eventually part realms as friends, but he leaves her with a favored leather jacket.


Thor's reign
When Thor assumes the throne of Asgard following Odin's death, he becomes torn between his duties as king and his desire to keep mortals from harm. Thor resolves this by bringing Asgard to Earth and reshaping the world in his image. Though his intentions are noble, a nightmarish future follows as Thor's reign on Earth becomes tyrannical. Sif, unwilling to go along with this new vision, is exiled from Asgard. Thor eventually marries the Enchantress and has a son, Magni. As an adult seeking understanding of these events, Magni finds Sif, who influences him to rise up against his father even though she still loves him. Following Magni's death in a battle involving Thor, Thor Girl and Desak, Thor sees the error of his ways and travels back in time to undo what he has done.

After the timeline is reset, Loki brings about Ragnarök in Asgard, during which the godly forces swiftly lose ground. Sif survives the first wave of losses but loses an arm. She is rescued by Brunnhilde, who is later killed by Durok the Demolisher. Sif honors Brunnhilde's death by taking her sword and leading the Valkyrior in the final battle. Sif falls in battle against Surtur's forces, dying side by side with Volstagg. All of Asgard falls soon after.


Reborn
Thor returns in time and restores the pantheon, beginning with Heimdall. After resurrecting the rest of the gods, Donald Blake goes to a hospital to try to find the reborn Sif. After wrongly thinking that she was reborn in Donald Blake's former love, Jane Foster, he leaves thinking that Sif won't come back. However, that scene reveals that Sif was reborn in an elderly woman in that hospital named Mrs. Chambers, who is suffering from what is thought to be terminal cancer. Loki has masked her from Thor's abilities, giving her a mirror that shows Sif her true form but prevents her from revealing her identity. Her host remains in the hospital, fighting for her life. Thor wondered what would happen to the spirit of an Asgardian if their host died.

Loki later reveals to Thor what happened to Sif and advises him to find her before Loki returns to his true form. Upon learning the truth from Mrs. Chambers, Jane Foster calls Donald Blake and informs him that she has found Sif, and Thor succeeds in restoring her. With Sif resurrected, Mrs. Chambers passes away. Sif then joins Thor in exile in Broxton, Oklahoma and checks into the same hotel as Donald Blake under the name Sylvan. While in Broxton, Sif struggles with the fact that Loki possessed her body while she was trapped in Mrs. Chambers' body. She aids Beta Ray Bill, whose starship, Skuttlebutt, has been invaded by virus-infected aliens. Sif is later seen defending Asgard during the Siege of Asgard and the Serpent's War.

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