He knew that Sif's hair of gold was Thor's greatest treasure - and he was determined to take it away from him. And while she was asleep, Loki took his shears and chopped off Sif's hair, every single lovely lock!
As a lark, Loki cut off the long golden hair of Sif, the wife of Þór, one night while she slept. In his rage, Þór demanded that Loki replace the hair, or else he would break every bone in Loki's body.
Further in Skáldskaparmál, Snorri relates a story where Loki cuts off Sif's hair as a prank. When Thor discovers this, he grabs hold of Loki, resulting in Loki swearing to have a headpiece made of gold to replace Sif's locks. Loki fulfills this promise by having a headpiece made by dwarfs, the Sons of Ivaldi.
Sif's golden hair, which symbolized her connection to the fertility of the land and the harvest of grain, was often praised. She was known to be very vain about its beauty. According to legend, Loki, the mischievous trickster fire god, cut off Sif's hair while she slept (in one version, he burns it off).
Sif was famous for her pure gold, flowing hair. Sif's unhappiness at the loss of her hair represented the darkness of the winter season.
Sif being secretly jealous of Jane is right in line with the comics. Marvel could continue following the comics by having Thor look to Sif now that his relationship with Jane is over.
Sif has been friends with Thor since childhood, even having a slight crush on him which she's never made known. Eventually, she did meet a romantic interest in an individual named Haldor, though we don't know much about him as he eventually died as a result of being enchanted by Lorelei (Elena Satin).
Sif is the Norse Goddess of Wheat, Earth, Harvest and Family. She is the second wife of Thor, the daughter-in-law of Odin, the step-mother of Magni, and the mother of Modi and Thrúd.
Thor and Sif
Odin found Thor's mortal love to be too much of a distraction on his path to (what was supposed to be) redemption. The All-Father feared his son would never awaken to his true godhood as long as he wanted to stay on Earth with Jane. So, he sent in Sif to hopefully sway his son back to Asgard.
Thompson explained of her character's trajectory in Thor 4, “As new king, she needs to find her queen … That will be her first order of business. She has some ideas.” Then Alexander happily endorsed this news—and volunteered Lady Sif as Valkyrie's queen.
In the form of a mare, Loki was impregnated by the stallion Svaðilfari and gave birth to the eight-legged horse Sleipnir.
Loki then took the hair out and put it on her head. Before Sif opened her eyes, the Gods, Goddesses, and everyone present started clapping and joyfully praising the most beautiful hair they had ever seen; even more beautiful and shinier than the hair she had.
In order to not draw too much attention to herself, Sif decided to wear a human outfit. She confronted the Kree, a warrior named Vin-Tak, in Portugal, and had a prolonged fight with him. Though she managed to damage his cloaking device, Vin-Tak struck her with his Truncheon, which made her lose her memory.
According to the Prose Edda (Skáldskaparmál ch. 35), the Norse god Loki once made a bet with the dwarf Brok, and wagered his head. He lost, and in due time the dwarves came to collect. Loki had no problem with giving up his head, but insisted they had absolutely no right to take any part of his neck.
Odin's abuse of both Loki and Thor, by contrast, is born of, at best, narcissism and at worst, malice. These are things that are less likely to change even if he could be made to see that his actions have been harmful.
(also spelled Siguna), in Norse mythology, one of the Asynjur goddesses, and the wife of Loki, the trickster fire god. Her name means “Victory Giver.” By Loki she had a son named Nari, or Narfi. But not much is known about Sigyn from the surviving literature, except in her connection to Loki's fate.
Conversation. 'Loki' composer, Natalie Holt confirms that Loki and Lady Sif slept together prior to the loop scene in Episode 4. (Source: youtube.com/watch?t=2266&v…) I don't know if the composer would necessarily know but it was obvious by the way Lady Sif was acting that it was more than hair that pissed her off.
Sif realizes how much Thor loves Jane Foster, and resolves to save her life.
Thor was married twice: first to Iarnsaxa and second to Sif. He had 3 sons and 1 daughter from these 2 marriages. He did not kill any of his family. In this respect he is nothing like Herakles who was promiscuous and uncaring towards his wives.
Frigg is the Queen of Asgard and the highest of the goddesses. Her home is called Fensalir, which means “hall of the marshlands”. She is married to Odin and her father is called Fjorgynn.
Heimdall is the brother of the warrior Sif. He is the all-seeing and all-hearing guardian sentry of Asgard who stands on the rainbow bridge Bifröst to watch for any attacks to Asgard.
However, as Odin's first born and most loyal and faithful servant, Hela was the original wielder of Mjolnir. Drawing enhanced strength and power from Asgard itself, at one point, Hela was the most powerful warrior in all Nine Realms, unmatched in every way.
Jane Foster is a superhero appearing in American comic books published by Marvel Comics. The character was introduced as a love interest of the superhero Thor Odinson until becoming a superhero in her own right.
So Thor and Korg took Lady Sif back to New Asgard where her wounds were tended to and she successfully recovered. As she was recovering from her injuries for most of the film she didn't participate in any of the fights, so other than losing an arm Lady Sif made it out of the film unscathed.
Sif in God of War Ragnarok
At the end of God of War Ragnarok, she is one of the few surviving Aesir gods and proves to be a worthy mother to Thrud, who she continues to care for and look after.