In the Japanese anime, as well as the English dub, the narrator of Attack on Titan is voiced by the same voice actor as Armin Arlert. Marina Inoue and Josh Grelle voice both characters, respectively, which has caused a stir in the fandom, bringing up speculations that Armin may be the narrator of the series.
“Maybe Armin is writing everything for us to read several years later or for a history book,” went the prime point in Sookey5’s Wiki post pointing out this theory. SheepyBoo also speculates the narration comes from an older Armin, and that the narrator is, “actually Armin, but when he grows up.” It certainly feels plausible.
So Titans are always frantically eating humans, even though they have no means of digesting them. What’s up with that? Well, according to -V0lD on Reddit, it’s actually the “general speculation” of the entire Attack on Titan subreddit that Titans subconsciously know eating a Titan shifter will revert them back to human form. Therefore, they eat every person in the hopes they’ll turn back, even though they don’t seem outwardly to have any real drive or motivation.
FangedFish on Reddit made a post claiming the fearsome giants are actually trying to hold onto humanity, going from person to person desperately trying to eat a shifter because, “subconsciously they want to become human again.”
Annie has a lot of secrets to reveal and a much, much deeper story developing for her. Well, once she gets out of her crystal cocoon. According to a theory posted by Eobard95, Annie only has a set time left to live, and being completely crystallized might be slowing down her death. If so, it’s in her best interest to save her strength for a massive final fight, which will most likely be against Marley.
If the Survey Corps can convince Annie to join them, even out of anger or a desire for revenge against the people who put her in this situation, then it would prove to be a grand comeback for her.
The walls guarding humanity against the onslaught of Titans are actually composed of Titans, this much we know for sure. But what will their fate be? Snkconspiracytheories thinks these Titans are going to be used by Eren as the ultimate weapon of war.
With thousands of Titans residing inside of the walls, they will inevitably be, “The strongest weapon to end the war against Marley.”
In a very well thought-out and scientific theory about the physical composition of the Titans, fans have theorized that Titans are actually made of yeast. Not only does highly fertile yeast collect around the outskirts of Wall Sina, where there are a ton of Titans, fans have pointed out numerous connections between yeast and the behavior of the giant, bumbling beasts.
Tumblr user danilovesanimenel reposted the theory from a Ymir page, pointing out their personally discovered yeast facts. They show that, scientifically, “yeast produces a large amount of gas and heat, much like the bodies of Titans,” and that “UV rays increase yeast productivity,” which “means that if a large component of a Titan’s biology is yeast, then the reason for their sluggishness during the night is that the sun is their energy.” Frankly, the whole argument is pretty compelling.
Eren, Armin, and Mikasa have been together since they were children. Eren and Armin are driven by a desire to kill Titans and save humanity, while Mikasa is more concerned about just Eren. Nylla Camphry predicts that Eren will die in a grand sacrificial way to save mankind, in line with his personality and drive. She also predicts that Eren will have to eat other humans to gain Titan powers, and that it may even come to the point where Eren must eat Armin.
Nylla Camphry goes on to state that Mikasa will be the only survivor of the three childhood friends, as it would tragically suit her character of not wanting to be alone.
Humanity has retreated within giantantic walls to protect themselves from the man-eating Titans. While it’s known that the Walls were created by Titans, xDollfie theorizes that the Walls are actually made up of humans who can become Titans. In other words, the Walls are humans standing in a circle, constantly in Titan form. What’s even crazier is that the Walls have been in place for over 100 years, meaning that these human-shifting Titans have been standing there for a very long time.
xDollfie also predicts that many humans (to create three walls) were forced to sacrifice their lives to live within the Walls and become the Walls.
Some Attack on Titan theorists believe the soldier Eren Kreuger is a reincarnation of Eren Jaeger from a past life, which is why he knew both Armin and Mikasa before their birth.
In a Wiki thread posted about the theory by Eobard95, user Xinomorph noted that a reincarnation theory wouldn’t be totally out of the ordinary, as Attack on Titan contains a lot of references to Norse folklore and mythology. The Norse believed that a dead person would come back to this world, reincarnated as the person they’re named after. This could very well explain why Eren’s father named him as he did, so that the Eren Kreuger could come to life once again.
As stated by Redditor dustofoblivion123, “When he dies, he sends some of his memories of his own life to Eren Kruger, thereby influencing his own father’s actions and changing his own destiny in his next life.”
Not only is there blatant militant symbolism that could easily lead a viewer to believe Attack on Titan is an analogy for WWII, there are also parts of the anime which parallel other pieces of literature centered around the bombing of Hiroshima. As writer and illustrator G.E. Gallas pointed out, there a few times that Attack on Titan events match up to moments in the manga series Barefoot Gen by Keiji Nakazawa.
She also pointed out that Titans are kind of visually similar to some victims of the atomic bomb, but these aren’t the only correlations between the anime and the Second World War. GrouchyMcSurly on Reddit also brought to light a few similarities, making claims that both title and theme of Attack on Titan, “parallel the words of Japan’s Commander-in-Chief Yamamoto: ‘I fear all we have done is to awaken a sleeping giant and fill him with a terrible resolve.’ This was allegedly written in a letter after his attack on Pearl Harbor.” They also point out that, “The songs played in the introduction are in German. They are the voice that inspires them to rise up and hunt, similarly to how Germany led Japan into the folly of WW2.” While that connection seems a bit tenuous, the sheer amount of similarities seems to mean something.
Linking Attack on Titan numerology with Nostradamus’ theory of the end of the world together, Amino Apps contributor Flare has a theory that the sun sets for humanity’s existence in the year 999, and the “1” from the original 1999 world end theory will represent the story’s “peak of power.” Humanity will end in one of two ways, according to this theory poster, either a traditional end of the world or a timeline reset.
Since it would be impossible for Eren to survive until the year 999, it could be that one of his descendants “obtains all other Titan shifting powers and transforms into a ‘God-like’ figure using the Coordinate to bring an end to the current timeline forcing it to reset,” or, “Ymir Fritz will be revived in some fashion and will bring about the end of the world with her power.”
Either Pieck or Gabi could be Bertholt’s sibling. Either one could fill in some questionable gaps in the Attack on Titan story. Theorist Momtaku made a point that Marley sees an advantage to, “bringing children from the same family into their ranks.”
If Bertholdt’s sister was Gabi, it would also fill in some blanks and help us realize why Reiner is so attached to her.
There are a few theories circulating out there that speculate Eren is a time traveler from the future, whose sole purpose is to save humanity. It all seems to stem from the title card and the opening scene of the first episode of the first season, “To you, 2000 years from now,” which seems to set the series up as a kind of epistolary.
Redditor real_life_corgi notes that in the opening scene of the manga, Mikasa’s words to Eren are “See you later, Eren,” and after he wakes up from his mysterious dream, he makes a comment that Mikasa’s hair looks longer. But this is only foreshadowing of what’s to come, and it involves a giant temporal loop featuring time machines, the death of Eren, his eventual rebirth, and humanity’s inevitable extinction.
When Annie is in hot pursuit of the Special Operation Squad during Season 1, episode 20, a cloaked person trails the squad, swoops in, and promptly kills Gunther. What-a-joice posted their thoughts on the matter on Tumblr. Upon close observation, you see, they noticed details such as the orange sweater underneath the figure’s hood, and their small, sharp nose. They came to the conclusion the attacker doesn’t seem to be Annie at all.
Instead of Annie, it’s possible the person under the cloak could actually be Marco. The mysterious person even shares the same freckles as Marco. Although presumed dead by his fellow soldiers, Marco could actually be a Titan shifter who made an escape.
The political undertones in Attack on Titan have been pointed out by many people. From avid fans to political Chinese protestors, people have related the series to the realtionship between the Japanese and Chinese governments in several interesting forms.
“Maybe we’re Eren and Mikasa inside Wall Rose,” proclaimed a Chinese protestor, relating the giant Titans to Japan’s neighbor, mainland China. Solomon, another theorist, also linked the walls to Japan’s oceans, and the Survey Corps to the Japanese Marine Corps.
Attack on Titan is about people being slaughtered and eaten alive by monsters while they live in captivity. Naturally, some fans have come to believe that Attack on Titan heavily supports the notion of vegetarianism or veganism.
Redditor timmyto441 dives into an exploration of this topic with a detailed post relating the mindsets of the people inside the walls with that of livestock like cattle. They compare humanity’s life in the walls with being “trapped by an electric fence,” and even compares their lack of knowledge of what lies beyond the walls to that of how “a cow knows nothing beyond the fence, it’s whole world is within the fence.” Given that the Titans are portrayed as disgusting and mindless, it’s pretty clear AoT is not on the side of the carnivores.