WARNING: POTENTIAL SPOILERS!!! READ AT YOUR OWN RISK!
Alright, so we all know there's a ton of theories out there as to what happens to the MCU AFTER PHASE THREE. I've seen everything from the Secret Invasion to World War Hulk.
World War Hulk
Maybe we WILL see those, along with sequels such as Captain Marvel, Black Panther, and Inhumans. Hel, maybe we'll even get a Budapest movie. Okay, so we have comic fan favorites and sequels checked, but what will Marvel gamble with? We know because of Guardians of the Galaxy that Marvel can take lesser-known characters and turn them into big time successes. So what will Marvel roll the dice with in phase four?
I'm willing to bet that a little trickster could answer that question for us.
Thor and Loki in Journey into Mystery
But that all depends on how Thor: Ragnarök plays out. If it goes anything like how I think it will-- with Loki seemingly playing villian and erasing his name from the Book of Hel before sacrificing himself to heroically vanquish the enemy (be it Serpent or Surtur, because I can see it either way)--people such as I will weep at our beloved trickster's death.
It's no secret Loki has arguably more fans than Thor, himself, and what better way to get people back into the theaters than to bring him back after a self-sacrifing death that wouldn't have been necessary if he hadn't unleashed Asgard's end in the first place?
Their reaction (Not my gif)
Everyone will be left wondering, "What in the nine realms?!" and curiosity kills the cat. People will be intrigued, or at least confused enough to want to get the story straight (or as straight as it'll get with the silver-tongued liesmith about).
With a Thor distraught over both the destruction of Asgard and the seeming death of his brother, he'd easily hope to find Loki alive. At any sign of it being possible, he'd jump, thus bringing Kid Loki into the picture. This would bring severe empathy to the fans, as it is revealed that Loki's only true plan was to commit suicide and return to have a chance at redemption--to be rebranded as a hero.
You might be thinking, "So what? Whoopdee doo. A little Loki." but look at all the things this could introduce, like the confusing loopholes of cheating death found throughout the comics, or the Dísir. Sigurd the Great could also be introduced, and Leah of Hel (the quite literally handmaiden of Hela).
Leah and Loki from Journey into Mystery
And that's not all. Kid Loki, in the comics, goes on to join the Young Avengers team.
Young Avengers Variant Cover
Another member of this team include not so little Cassie Lang, aka Stature. She's been introduced to the MCU already, in Ant-Man, as she is his daughter. The Scarlet Witch and Vision also have a child in the comics, magically, as Vision is a robot. Their son's name is Billy Kaplan, aka Wiccan. He, too, is a member of the Young Avengers. Teddy Altman, better known as Hulkling, is the offspring of a Kree and a Skrull during the Kree-Skrull war, which could be altered from the comics to have a similar impact on Earth as the Secret Invasion (already speculated to be in the future of the MCU) did. He's a Young Avenger, too.
Marvel has recently stated that they will be adding a LGBT couple to the Marvel Cinematic Universe soon (within a decade-ish, I believe), and Hulkling and Wiccan would easily fit that description, among other things. I mean, one is an "abomination" to both of his species and a prince. The other is the Demiurge.
Wiccan and Hulkling in Young Avengers
Another Moviepilot article I found sturdily supporting the Young Avengers theory and making connections to the already-established parts of the MCU can be found here:
So, what do you think? Will Marvel give the kids some screen time in phase four?