Note: Spoilers for Thor, The Avengers, and [Thor: The Dark World](movie:206462) follow.
After three years and as many movies, Loki has become a favorite character in the MCU fanbase as the guy everyone loves to hate (or hates to love, depending on who you are). Over the course of those three movies, we have seen Thor's adopted brother transform as a character. Starting as the hidden snake within Asgard in Thor, he became everyone's favorite villain when he showed up and nearly took over the earth with the help of the Chitauri in [The Avengers](movie:9040). After returning to Asgard as a prisoner in Thor: The Dark World, he became Thor's unlikely ally in his attempt to stop Malekith from plunging the universe back into eternal darkness.
But could Loki be hiding a massive secret that has been hiding under our noses the entire time? After browsing reddit, I have discovered a fan theory that could very well prove to be true when [Thor: Ragnarok](movie:956858) hits theaters.
Still with me? Awesome, then here it is:
Loki has a child.
Okay, so maybe that was a little anticlimactic, until you hear who that child is. Want to find out? Keep reading.
A Little Background
In the Marvel Comics Universe, Loki (sort of) has a child. This child is the Asgardian goddess of Death, who goes by the name Hela. Technically her father is an earlier version of Loki (before he was actually called Loki), while her mother is the giantess Angrboda. She was appointed by Odin to be the keeper of the dead in Valhalla when she reached the proper age. However, as Odin's attention to Valhalla lessened over the years, Hela attempted to take it for herself, but was unsuccessful in the attempt. Over the years (in the comics) she has formed many alliances with other gods and villains, and proven to be a persistent foe to Thor (much like her father, Loki). This theory will expand on the idea of Hela, and adapt it to the Marvel Cinematic Universe.
Evidence of Loki's Past on Earth
1. Loki has many paths in and out of Asgard
To his own credit (both in Thor and Thor: The Dark World) Loki knows many paths in and out of Asgard besides the Bifrost, ones that even the all-knowing Odin has no knowledge of. One of these portals is even used in Thor: The Dark World by Thor, Jane and Loki to get to Svartalfheim, the realm of the Dark Elves. During this scene, Loki also states something along the lines of "If they were easy, everyone would use them" (I'm paraphrasing, sue me). He also displays far more knowledge of other realms, including Jotunheim and even Earth (Midgard), suggesting that he has visited these realms in the past, probably in disguise. (This is separate from Thor's group's visits to Earth mentioned in the first Thor, and he probably visited Earth in the more recent past).
2. The way he speaks
As shown by the hilarious scene pictured above, Thor displayed little to no knowledge of Earth's culture when he was banished, and still acted like he did in Asgard. Earlier, it is stated that he had been to Earth before, but this was likely hundreds of years ago, when the people of Earth would revere him as a god as long as he flashed some lightning and thunder. Loki, however, is a little different. From what we've seen in his scenes on Earth, Loki is far more reserved and less boisterous than Thor. Also, when he speaks, though he is extremely sophisticated in his choice of words and speech patterns, it is usually easier to understand, and his general talk sounds more like Victorian English, as opposed to Thor, whose loud speech and antics sound more like he belongs in a Viking mead hall.
3. Loki's familiarity with Earth
Now, one of the most important points of this argument. Loki is more familiar with many things from Earth, and shows a comfortability that his fellow Asgardians lack. He knows what Earth's technology is like (saying "cars" instead of "metal chariots" or something similar). Also, whenever he is disguised on Earth, he is always shown in a clean, high-end suit, displaying a minor knowledge of Earth's fashions and what a man of his age would be expected to wear.
Now we have reached the main theory. The linchpin of this theory is a single line of dialogue from Thor: The Dark World. When Thor and Loki are traveling to Svartalfheim to confront Malekith, Loki notices Thor's concern for Jane, and comments specifically on the fragile and mortal nature of human beings.
His exact words are:
"This day, the next, a hundred years, it's nothing! It's a heartbeat. You'll never be ready. The only woman whose love you prize will be snatched from you."
Now look carefully at how these words are spoken. Many viewers would simply chalk it up to Loki trying to be cruel to Thor, but his tone is far from simple cruelty. Loki speaks from experience. He's telling Thor about losing Jane because he himself lost someone at some point in the past.
I think Loki was in love. At some point, probably in the mid-late 1980s, Loki fell in love with an Earth woman, and had a brief affair with her, using his disguises to hide the fact that he is from Asgard. Then, the woman died, and this loss fueled Loki's rage and further alienated him from his adoptive family (and may have even spurned his desire to search for his true parentage, which he eventually found in the Frost Giants).
However, unbeknownst to Loki, the woman had a child before she died. A child that was half-Midgardian, half-Asgardian. A child that may or may not cause weird stuff to happen whenever she's around. And that child is . . . (drumroll, please)
Wait for it . . .
Yup, that's right. The ever-quirky and hilarious Darcy Lewis, Jane Foster's assistant, is actually the illegitimate child of Loki and an Earth woman.
For the purposes of the evidence, I will refer to Loki as an Asgardian, even though he is technically a Frost Giant.
In the first Thor, Thor is banished to Earth via the Bifrost, and ends up in New Mexico, smacking into the side of Jane's research vehicle before being put down by Darcy's taser. Now, one can simply chalk the location up to random chance (considering the Bifrost can deposit someone anywhere on Earth), but what if the Bifrost itself (or even Heimdall) instinctively placed Thor very near another (half) Asgardian, in order to make his transition to Earth easier?
More evidence to this would be the strange inter-dimensional actions in Thor: The Dark World. When Jane, Darcy, and Ian arrive at the site of the strange occurrences, including gravitational anomalies and wormholes, Jane is quickly sucked into an unknown dimension, which also happens to be right next to the Aether. Another massive coincidence? The kids were playing with the messed-up gravity and portals for hours completely innocuously, and only minutes after Jane's group shows up, she is sucked in. Honestly, what are the odds that, of all the Nine Realms and many other places in between, Jane just so happens to be taken right next to where the Aether is hidden? Literally astronomical. The easy answer? The screenwriters are lazy. The much better explanation? The proximity of Darcy's Asgardian side activated the portal, and Jane was sucked in by mistake. Hard to argue with the fact that weird things seem to happen when Darcy is around.
So, is Darcy actually the infamous Hela, daughter of Loki? Will her true nature be revealed in the upcoming Thor: Ragnarok? We obviously don't know for sure, but there is some pretty good evidence to support it!