Created by writers Stan Lee, Larry Lieber, and artist Jack Kirby, the character first appeared in Journey into Mystery #84 (September 1962). Jane Foster was introduced as a love interest of the superhero Thor Odinson until becoming a superhero in her own right.
Thor heads to New Asgard and gets the surprise of his life – his ex-flame Jane Foster (Natalie Portman) has awoken his old hammer Mjolnir and given her the powers of Thor. Now known as the Mighty Thor, she protects New Asgard.
The love interest that is inescapable for Thor thanks to Marvel audiences, Jane Foster is arguably the love of the Asgardian's life. A caring, down-to-Earth mortal, Jane has had a fascinating character trajectory that rivals that of her partner.
The moment in which Love returns and takes the form of Eternity suggests that she shares many abilities with the cosmic entity. However, her being only a product of Eternity suggests that she might not have the full breadth of the entity's powers.
Lady Sif is a fearsome Asgardian warrior and a good friend of Thor and the Warriors Three. When Thor almost provoked a war with the Frost Giants and ended up powerless on Earth, Sif and her friends disobeyed the orders of their new king Loki and went to Earth to save him.
Sif the warrior even tried to compromise and live a mortal life, for a time. She quickly got bored, though, and grew frustrated that Thor had only affections for Jane Foster. Sif does love Thor, but their attempts at relationship are always frustrated by the interruptions of another woman, be it Jane or Amora.
Cosmic Energy Manipulation: Due to being revived by Eternity, Love has been bestowed with the ability to manipulate cosmic energy. Optic Blasts: Love is able to project powerful magenta cosmic energy blasts from her eyes.
While Thor: Love and Thunder establishes that Eternity is a being capable of granting literally any wish, it doesn't go so far as to confirm how powerful he actually is.
Sif. Sif is one of Thor's closest friends and she had a romantic interest on him. She was protective of him and even willing to aid him if it meant treason. Thor even supported her when she became one of the best warriors of Asgard, despite being a woman.
As Heimdall was Thor's best friend, Thor took his death the hardest out of the deaths of the Asgardians, surpassed only by the grief he felt for Loki, who died soon after Heimdall. Thor even vowed to kill Thanos after the latter killed Heimdall, despite having been incapacitated.
The Olympian and the Asgardian are evenly matched in terms of both strength and durability. For comparison, both Thor and Hercules' durability and raw power pale in comparison to the likes of Zeus - a low-key but crucial Thor: Love and Thunder spoiler for any future outings of the Olympians.
The Living Tribunal is one of the most powerful being in the Marvel Universe, surpassing Galactus, Eternity, and Infinity. He can easily destroy or create universes or multiverses, capable of crossing through any dimension or universe.
Through its mystery and the likelihood that Thanos doesn't even know of its existence, Eternity is likely like a forgotten God that chose when it should and shouldn't be seen.
Eternity is actually the embodiment of the Universe, along with his sister, Infinity. According to the comics, Eternity is a cosmic-level entity, but not a Celestial, as the Celestials are a specific type of cosmic being created by the First Firmament.
Love is a new character (she isn't in the comics) so Taika must be doing something new. She is born from Eternity (and seems to possess his powers. Not to mention she's a girl (just like Infinity is depicted). But here's the clincher: When Love is revived by Eternity we see her reflection in the water.
In the climax of Death of the Mighty Thor, Jane succumbed to her cancer after becoming Mighty Thor to defeat the Mangog, but Thor and Odin were able to revive her by harnessing the power of the God Tempest, the cosmic thunderstorm that dwells within Mjolnir.
It was made obvious in Sif's scenes with Thor that she held long-lasting, unrequited feelings for him. Considering that Thor was in love with Jane, Sif never acted on them. Sif being secretly jealous of Jane is right in line with the comics.
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.
At some point in her life, Sif met Thor, falling in love with him and later getting married. Sometime during their marriage, Thor in an act of infidelity, cheated on his wife Sif with the Jötunn, Járnsaxa. Through Járnsaxa, Sif became the stepmother to Thor's eldest son, Magni.
