Sif is a fictional character in Marvel Comics, in particular those featuring Thor. An Asgardian warrior and lover of Thor, she spends much of her time worrying about and searching for him. Sif often accompanies Thor and Balder into battle, who has developed an attraction to her; however faithful Sif never shows affection for anyone but Thor and certain individuals that resemble him greatly. She is based on the mythological being of the same name. She first appeared in Journey Into Mystery #102.
Sister of Heimdall, Sif has been the constant companion of Thor and Balder since childhood. Like most Asgardians, Sif was born with golden hair, which was turned black after Loki jealously 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 of all of Asgard, matched only by Brunnhilde. At one point she was given to the death goddess Hela by a giant in exchange for immortality, but Thor saved her by offering himself in her place. Hela was so impressed that she let them both go. This meant Thor was finally worthy to lift Mjolnir, as he had faced Death.
Sif and Thor are separated when he is banished from Asgard by his father Odin and 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, where she is granted immortality but after she 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 one of the Asgardians that 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 so that she could try to understand Thor's attraction to mortals, especially Jane Foster. 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 when gaining the power of Thor thanks to Loki, does so as he is attracted to Sif, and kidnaps her, although she convinces him to return and save Asgard from Ragnarok.
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