Although they are commonly represented as brothers in modern literature and representations, traditionally they were not considered brothers. Loki became blood brothers with Odin, Thor's father, after they participated in a blood-sharing ritual. Loki is thus Thor's adopted uncle, not his adopted brother.
While the Loki of the Marvel comics and films does derive his cunning character from the Loki of Norse myth, the biggest difference is that in the Marvel universe, Loki is depicted as the adopted brother and son of Thor and Odin.
Loki is the son of Fárbauti (a jötunn) and Laufey (mentioned as a goddess), and the brother of Helblindi and Býleistr. Loki is married to Sigyn and they have two sons, Narfi or Nari and Váli.
Thor is the son of Odin, All-Father of Asgard, and the royal All-Mother Freyja. Loki is his adoptive brother, the son of Frost Giant King Laufey of Jotunheim who was taken in by Odin when Laufey abandoned him. It's important to note that they also have a sister, Angela.
So, in the realm of comic books, Thor takes the role of the older brother to the ever-tricky Loki. Thor is older than Loki. It is said in the first movie of Thor , that Loki was the second son of Odin and Thor first son. Loki was actually adopted.
While Loki and Thor did, by heart, truly love each other as brothers, their intention to rule Asgard made them fierce rivals. However, Thor evolved himself by learning that a true leader doesn't start wars or seek to conquer other territories, while Loki sought to control the world and gain more power over others.
Lunari is Loki's twin siser. Brought up in Jotunheim under her father Laufey, as a warrior, but a princess as well, she had to take the thrown after her father's death. Now she needs to find her brother and what she meets is far from what she expected.
Odin probably just told Thor in between the events of Thor and The Avengers. It seemed like it was kept a secret more for Loki's sake than anyone, so once he found out it wasn't really a secret anymore. By the time of Thor: Ragnarok it appears to be public knowledge.
One of the Norse gods of Asgard, Balder is the half-brother of Thor, a companion to the Warriors Three, and a loyal follower and son of the ruler of the gods, Odin.
Ages ago, Odin fought and defeated Laufey and the Frost Giants of Jotunheim in a great war. Abandoned and left for dead as a baby due to his diminutive size, Odin took Loki, son of Laufey, to Asgard to raise him as his son and a prince in order to one day unite the Frost Giants and the Asgards in peace.
In both the comics and Norse mythology, Loki had been portrayed as gender-fluid. In Norse mythology, Loki was first recognized as a “shapeshifter” when Loki lived as a handmaiden for eight years. Loki's first mention as being gender-fluid in the Marvel comics was when he stole the female form of Sif.
The God of War Loki's lineage is quite different, with Laufey as his birth mother and the Greek demigod, Kratos, as his birth father. GOW's Loki is known as Atreus throughout the duration of the game, and his true identity is only discovered at its conclusion.
Loki is Thor's adopted brother and the Asgardian god of mischief. In his younger years, he and Loki were very close and good friends, even if occasionally irritated by Loki's mischief. However, it is later revealed that Loki was often jealous of Thor even back then, and resented being left in his "shadow".
The reason for Odin's favoritism of Thor over Loki, hides in the one-eyed god's past and his relationship with his brother Cul, the God of Fear. Most Marvel fans think that Odin favors Thor over Loki because the former is his natural son, while Loki is the adopted son of the giant Laufey.
We didn't know Loki's destination, but, as seen in the premiere of Loki, he landed up in a desert, but was whisked away by the TVA who had tracked the location that Loki had disappeared to. And that is how Loki is still alive and ready to lead his own Disney+ show.
Loki often hid a degree of jealousy that Thor was to become King, and felt that Odin perhaps favoured Thor over him. As Thor was always the center of attention, Loki found himself longing for a spotlight over the years, which manifested itself in extreme attention-seeking behaviour.
In 965 A.D., Odin led the Asgardians to victory in a war with the Frost Giants and he found baby Loki abandoned in a temple. Odin brought Loki back to Asgard and raised him as his son alongside Thor. But Loki yearned for the throne that was intended for his brother.
Raised alongside her older brothers, Thor and Loki, Freya grows close to both of them. Thor trains Freya how to fight; however as she improves, Thor begins letting her win every match. One day at training, she successfully defeats her brother in their combat training.
Loki shapeshifted and turned himself into an alluring female horse to draw Svaðilfari away from helping the master builder complete Asgard's fortifications. When they were together, Loki and Svaðilfari mated. Loki subsequently became pregnant and gave birth to Sleipnir.
Loki was regarded by the ancient Norse people as the god of mischief, trickery, and deception. He was also seen as the father of several gods and Jotunns, including Sleipnir, Hel, Jormungandr, and Fenrir.
Atreus and Loki have always been one in the same character in God of War, but the name has far less significance to both Kratos and Atreus than it does to the audience. Loki, as it was revealed, was the name that Kratos' wife, Faye, wanted to give Atreus when he was born.
Citing the Marvel Visual Dictionary, this theory explains that Odin used magic to make Loki seem Asgardian. However, Odin must have used stronger magic than a simple illusion. Otherwise, Loki would have turned blue in Loki when he entered the Time Variance Authority (TVA) Office, where magic and powers did not work.
Atreus is the son of Kratos in Faye. For most of his life, his father was absent, which led him to believe Kratos didn't care for him or his mother. In consequence, Faye was the one who raised him, so she taught him many languages, how to use magic, as well as all about the Norse gods and myths.
