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Xenoblade Chronicles X will be a Crisis Crossover of the Xeno-series.
The game will have you travel to the alternate universes where games like Xenosaga, Xenogear and the original Xenoblade took place, to try and stop some dude from becoming god or destroying the world or whatever.
  • Jossed: Xenoblade X is a self-contained story.

Xenoblade Chronicles X is a distant sequel to Xenoblade.
After the defeat of Zanza and the fall of the Bionis, humans from the universe Zanza was from crash land in the world of Xenoblade. Unfortunately, the aliens also followed them there.

Xenoblade Chronicles X will shed some light on Zanza's
backstorySpecifically, it will go into detail about what Zanza and Meyneth were working on before they accidently destroyed the universe. And some asshole is going to try to replicate their experiment in the hopes of destroying the world or becoming god or whatever.

The alien race in the white ship at the start will help the humans deal with the other alien race
The E3 2014 trailer shows a character that clearly isn't a human riding in a mech alongside the other characters, whether the whole race is helping or just that one character is unknown.
  • Jossed. That alien is L, a Miran native. The aliens on the "white ship" are something else entirely.

New Los Angeles can be expanded by finding other escape pods in the world
New Los Angeles is empty when first seen, with only a residential section, commercial section and the Blade Tower. Finding more people (like farmers) will add more sections to the town.
  • No, NLA expands as you meet friendly aliens. The only additional district is the Ma-non ship.

The final boss of the game will be God or at least a god like entity
The final boss of most of the Xeno games is a god of some sort, so its likely the final boss of this game will also be a god.
  • It's kind of a staple of the series, so that's a safe bet.
    • Double Subverted: The final boss is an amalgamation of Lao, Luxxar and the deceased, physical shell of the Ganglion god "The Great One". So while the god alone is not the final boss, his body an aspect of it.

You are "a vessel with which to meet our lord".

Basically, the game will play with the concept of "protagonist without personality" by making the player character an actual Empty Shell that was created to be a vessel to another entity. For some reason, you was lost and the antagonists are trying to reclaim you back.

  • Jossed. The "vessel" refers to an in-universe MacGuffin.
    • Maybe, maybe not. By all indication, the Player Character isn't a member of the White Whale's crew, given what is discovered in the Lifehold Core.

"B.L.A.D.E." is a codename for the Player Character
And this is how your party members will address you instead of by your chosen name, sort of like how "Shepard" is used in Mass Effect. It also works as a title, since Fei, Shion, and Shulk have all been "Destiny Emancipators" in their own time.
  • We now know the name of the player character is Cross.
  • BLADE is confirmed to be the name of the military organization that Elma works for.

Xenoblade Chronicles X will feature more Expies or Archetypal Characters then have been shown.
We've already seen Lao (recursion of Dunban, Jin Uzuki, and Citan Uzuki) and Tatsu (Riki and Chu-Chu), so we should expect to see a Robot Girl (Fiora, KOS-MOS and Emeralda) join the main party as a playable character and a silver/white haired Bishonen with heavy influence on the plot (Alvis and chaos) to show up and be mysterious.
  • If Cross is customized then there's your Robot Girl and Elma is a mysterious character who has a heavy influence on the plot.
    • Not quite. In this situation all the humans are actual Robot Girls with only Elma's being a remote controlled drone. Furthermore, Nagi's far more of a Citan expy than Lao is, especially when it comes to his choice of weaponry, nationality and Cutscene Power to the Max.

Elma is not really human.
There's no way the combination of white hair, dark skin and blue eyes could be natural. That, and it brings in mind KOS-MOS, T-ELOS,
chaos and Wilhelm, neither of which being really human.
  • Confirmed. Elma is actually an alien whose's true form closely resembles KOS-MOS. The white hair, dark skin and blue eyes Elma is actually a Remote Body.

Xenoblade X is a prequel to Xenoblade.
Pushed to the brink of extinction by the aliens, humanity looks towards any options available to them to extend their existence. Klaus comes along with his project to create a new universe where humanity/Homs will be safe from the alien threat. Naturally, the protagonists either fail to stop or side with this project, resulting in the world of the Mechonis and the Bionis.
  • Highly unlikely considering that Klaus' experiments clearly took place in orbit of Earth not Mira and Earth was destroyed in the prologue of X, meaning those experiments couldn't have taken place.
    • Fully jossed, the games are all but unrelated.
    • It doesn't seem like there's much of a connection but it isn't entirely impossible. Lin does theorize that Earth wasn't completely destroyed and the technology Klaus uses to create an entire universe could mean his civilization is advanced enough to literally make a new Earth. Tatsu also does refer to the humans as hom homs at one point much to people's confusion. Course it's just as likely a distant sequel to Xenoblade in the world Shulk created.

The Monado will appear at some point.
  • The original game was called Xenoblade Chronicles because of the Monado that appears in-story. What's to say that the exact same Monado, even if in a different form that we're used to, will appear in this game as well?
  • Correct. Lin wears Monado hairpins. Oh, and there's a holo-trophy sight gag involving the Monapon. In case it weren't obvious, Jossed.

Xenoblade Chronicles X is a Stealth Sequel.
  • You only find out near the end of the game that the planet that New Los Angeles crash lands upon was the exact same world seen in the epilogue in the game, and that Alvis, himself, will appear at some point. The fact that the planet has sapient species other than those featured in the original game proves Alivs correct that their new home's now home to many other life alongside the original races from the first game.

Elma is the reincarnation of Mary Magdalene.
  • If her true form's striking resembles to KOS-MOS is anything to go by.

Mira is the planet seen at the end of DYE Fantasy
  • When the girl steps out of the pool and the shadows recede, she finds herself on a plateau overlooking a strange alien vista in a desert like region. Further, it has several moons and is inhabited by an enormous Cthulhu type entity. It's possible that she wound up on planet Mira, which also has a desert and several moons. Meaning, the entity she saw may have been a Nemesis. No wonder she shat herself. It'd certainly be a fitting explanation of how Oblivia got its name.

L named himself after L from Death Note
  • He did have access to about a third of the Library of Congress, who's to say that Death Note isn't somewhere in there?
    • Funny, but no. L is his actual name.

A reasonable explanation for the Silent Protagonist in Chapter 5
  • It seems like a stretch that they wouldn't at least record a few lines for each voice option for that particular scene. Having your arm blown off and discovering you're a robot would seem like it would cause some scream - Rook's clearly in excruciating pain. A possible explanation: To borrow Metal Gear Rising's term for it, the player character suffers a Body-Machine Interface error. The pain and shock throws off their ability to remote-control their body properly, and the vocoder was the first thing they lost control of.
    • Clever, but wrong. Cross is a Heroic Mime, everyone behaves as if you're speaking. Plus they can Soul Voice just fine.

The prophecy that humans will destroy the Ganglion is self-fulfilling
  • Humans will destroy Luxaar and the Ganglion organization, but only because Luxaar gave in to the fear of the prophecies and instigated the whole conflict in the first place. Had he just left Earth alone nothing would have happened and thus the Ganglion wouldn't crumble from humans and their allies fighting back in self-defense. As it stands Luxaar has essentially ruined his organization due to his actions with losing many key allies such as the Wrothians, wasting tons of resources on fighting, being stuck on an uncharted planet with no reinforcements in sight, and ultimately getting himself killed.
    • While not all specifics are truly known about this prophecy, there is a degree of truth to this: Humans were engineered with the Ganglion race's biological weakness, and both races were created by the same Precursors. Moreover, Humans were engineered as a fail-safe against Ganglion revolt, meaning their actual purpose is to destroy the Ganglion should they revolt, which they did when they sought to destroy Humans out of fear of this very fact.

The second alien faction that caused the destruction of Earth were trying to prevent the Ganglion from destroying it.
  • They were either acting as agents of the Samaarians or just hated the Ganglion.
    • Perhaps they knew about the fact that human DNA can instantly kill the Ganglion and were thus trying to capture as many humans as possible for that purpose. They were the faction that attacked the White Whale while it was adrift in space and you'll notice, they chose to board the ship instead of destroying it outright, which is why the badass human Skell pilot had to go all Rambo on them and force them back into space.
    • It's mentioned that they mainly use Anti-Matter as a means of powering their weapons and vessels. When anti-matter comes in contact with Matter, annihilation is the result. I'm guessing Earth's destruction was completely by accident (even though the Ganglion were intentionally trying to destroy it anyway.)

At some point in development, Tatsu was going to be playable.
  • They scrapped him because having a fourth required member for story missions would completely lock-out the player's other party options. Damn shame, too, since Riki was such a Game-Breaker in the first game...
    • Confirmed. He has unused Soul Voices in the Japanese version which are only reserved for playable characters.

Mira is a Shield World.
  • It would explain why the planet doesn't show up on any starcharts, how various aliens keep getting sucked into it, and why leaving the planet is impossible, or at least very difficult. Not to mention the game's backstory certainly has no lack of similarities to Halo...
    • To expand: Mira has attributes of both Requiem and Genesis. It is likely mobile like Requiem was (and one of the spaceships that the second alien faction uses in the opening cutscene has a weapon that opens up like an iris, similar to how Requiem was presented in the first Halo 4 trailer), other species end up on the planet through a flash of light that they can't explain (just like how the Guardians' Slipspace portals accidentally drag Covenant forces into Genesis), and the inability to escape Mira is similar to an episode of the Spartan Ops campaign when the Infinity was "tethered" to Requiem and unable to break atmosphere thanks to a Forerunner artifact. The inability to leave a Shield World was also present in the Trevelyan Shield World as detailed in Halo: Glasslands thanks to being surrounded by a Slipspace bubble that puts the planet out of normal space.

After recreating the universe in Xenoblade, Shulk and co. become the Samaarians
  • Shulk is reincarnated into the new universe with a mortal form but a pretty lofty perspective, having gone from corpse to candidate for divinity in roughly the space of 10 years. Now possessing the ability to grasp the future at will even without the aid of the Monado, it is he who warns the new generation of humanity that their spacefaring exploits could very well end in disaster, and his words become the Prophecy which the Ganglion so fear. The Ganglion are created with an invariably fatal aversion to Samaarian DNA. Centuries later, defectors from the expansive Samaarian Empire settle on other worlds, becoming humanity.
    • The Nopon leave the world of the Hom Homs early, likely led by Riki or another Heropon, and find themselves marooned on Mira much earlier. They abandon their space-tech since it doesn't help them get off Mira but repurpose it to create the primarily thermal-based weaponry needed to survive on Mira. Tatsu remembers the phrase 'Hom Hom' as a distant Nopon fairy story, a mythical people which the humans resemble.
      • The Telethia regain their true form permanently, but are free of Zanza's control, and now inhabit nearly every planet in the universe, serving as guardian spirits.

Golbogga, the creator and "god" of the Zaruboggans is actually a Samaarian.

The end of the side quest "The Old Gods" reveals that not only did Golbogga actually exist, he/she looks just like a human. Seeing as the Samaarians are the ancestors of humanity, it wouldn't be too far a stretch to assume that the Samaarians look just like them. In turn, the Zaruboggans are a synthetic race with some mechanical components, but may not have the same sensitivity to human DNA as the Ganglion.

The Player Character
Is the Avatar... of the Planet MiraWhen the White Whale got caught up by the purple non-ganglion forces, Mira, perceived the ongoing fight, and for unknowable reasons decided to save the White Whale from destruction: it attracted the ship to its gravity wheel, found a way to preserve the data contained in the Lifehold so Humanity would survive, and finally hacked an empty mimeosome to start interact with Humanity. Perhaps Rook him/herself isn't aware that he's a sliver of the sentient planet s/he walks on but that would explain how an amnesiac refugee became such a formidable fighter so quickly, poor Luxzaar may have had the decks stacked waaaaaaaaaay against him from the very moment Mira took an interest in the White Whale

Murderess was originally meant to be DLC
  • During the cutscene in Chapter 12 where Elma sends out orders to the Skell teams approaching the Core, exactly five optional party members get a speaking role, one of the only times in the main story that optional characters get any focus. Four of them are Alexa, H.B., Bozé, and Yelv, who comprise the group of party members who were DLC in the Japanese version. The fifth is Murderess, who thus seems like the odd one out in the scene. Maybe this was a remnant from development, when she was also planned to be downloadable?
    • The climax, fighting for the Lifehold Core, also features these four characters in a cutscene, further supporting this theory.

is a Qlurian (or a sub-species of Qlurian), the same species as Celica. Both are elf-like species, and Celica is the only established Qlurian seen in-game, leaving some ambiguity as to whether they all look like her. In Chapter 12, Luxaar mentions that the Trion barrier technology being used to protect the Lifehold Core is only found in the Qlu System, only a few-letter difference between Qlurian. And Celica isn't native to Mira, and her home village was massacred by the Ganglion.
  • Ryyz might be a Qlurian too, as she has a little more resemblance to Celica than Elma does. Her ears look more similar (albeit with less fur) and she has black facial markings. Celica's village was wiped out by the Ganglion, but some of the other Ganglion-allied races (such as the Prone and Marnucks) had planetary civil wars fought over those alliances. Given the Ganglion's usual Join or Die policy, it's possible a few of them joined the coalition.

The cloaked man seen in the ending is the Great One Luxaar was referring to.

If you look closely at the intro again after beating the main story, you can briefly see the Vita fighting on the Ganglion's side, presumably with the Great One piloting it at the time. We hear nothing implying that there are any other Vita in existence, with plenty of evidence suggesting it's a one-of-a-kind craft—not just anybody's going to fuck off with it. If the Vita's on Mira, that means its pilot must be as well, perhaps on an entirely different continent from any we visit in X. That would explain how you're never able to run into the cloaked man or Lao in the post-game. Also, both the Great One and the cloaked man are two of the only characters not identified/named in the game.

  • Supplemental materials confirm he's called "The Black Knight", but there's no info on who or what it is beyond that. At the very least, addressing him as anything else would be incorrect.
  • Incorrect to address the Black Knight as anything other than "the Black Knight" on a speculation page? Might as well remove any speculation on the true identity of any masked character. Besides, it's not a hard connection to make: custom-made mecha found crash-landed with the pilot nowhere in sight, powerful-looking Skell pilot (going by the artbook) with a design unlike any other in the game found strolling around the same planet?
  • To add credit to this theory, Lao did merge with the Vita during the final battle. The Vita is said to be The Great One's original form, and it may even contain some of his memories. Like Luxaar, he too may be living within Lao, to some extent.

HB knew the Nopon whom he failed to save during his second Affinity Mission
Hence why he gets all so emotional at that moment.

How Cockpit Time works
When a character enters cockpit time in their skell, all the weapons instantly recharge because the character is rapidly pushing buttons to direct energy into the weapon systems, but it requires very fast pushing of many controls which is why it doesn't always happen.

One of the Ark Ships that escaped was The Eldridge
Not all the ships were only for evacuating humanity. Deus was an early prototype device to help colonize nother planet, but it got too powerful, and Earth's governments thought Deus was too dangerous to leave behind so the Eldridge was made to get rid of Deus and maybe meet up with humanity later, but then the Xenogears plot started. The Kadomony might have been a different version of the same instant bio-creation pods and memory copies that the White Whale had.

Wilhelm and the Immigrant Fleet made Earth disappear and framed the Ganglion
Elma and the Ganglion's arrival gave Wilhelm and his underlings the opportunity to use the Zohar to do whatever they did to Earth in the backstory of Xenosaga. Then they and what would become the Galaxy Federation escaped on board their own ark ships to a part of the universe untouched by the Ganglion or that group Elma belongs to, and Wilhelm erased all knowledge of the Ganglion war.

Rook has no human basis
Rook is a fully autonomous Mimeosome, one of the experiments created on the White Whale. Their activation pod was a retrofitted life pod, and the reason they have amnesia is because that is the first time they were activated. Yelv's affinity quest show memories can and have been manufactured by the government, so it's possible personalities can too.

Alternatively, Rook is a completely average human
When the Lifehold was destroyed and everyone's consciousness' were somehow put directly into their mims, it included every mim in stasis, every mim had to have already been registered to a consciousness, so when the computer broke during the crash, the mims were a place for any registered conscious to transfer to by whatever means it happened.

Rook has no memory simply because he/she was in stasis too long, because any other mims in stasis after the crash got out of stasis much sooner after having their consciousness put in their mims, Rook's mind was just inactive too long.

  • Despite taking place 2 months after landing on Mira, the game strongly implies that you were the ONLY one who was found since then. Everyone else was active or were activating in the process of the crash. Your situation is entirely unique, as nobody else reports having amnesia at all. The ending implies that anyone else who woke up after the crash would be no different from you.
  • There must have been other lifepods activated after the crash because elma states not many lifepods survived and that the player is one of the lucky few, she also had seemingly good experience with how people were after awakening from stasis.

Because really, can you think of a better explanation?

  • Seeing as their coaltion is a crime syndicate in the Samaar Federation, it would seem there's more to the Ganglion species' crusade against humanity than just being bio-engineered with a fatal weakness to their genes. Before the Ganglion attacked Earth and Elma's species gave humanity a big technological push, humans were otherwise too primitive to be considered a large-scale threat. However, not only are the humans a genetic fail-safe to the Ganglion if they were to revolt, humans were also descended from the Samaar Federation, also turning it into a sibling rivalry that humanity was oblivious to until now.
    • The Ganglion may have also have been trying to eliminate humanity to cover up the very idea that they have a biological weakness to an otherwise inconsequential primitive species in the first place, which may explain why Luxaar and Goetia spout religious pretenses when trying to justify their genocide campaign. Since they coerce a lot of other races that may not have such a perceived humiliating weakness into service (other non-Ganglion-species members could have worked their way up the chain of command), this information getting out to the lower-ranks would invalidate the alleged supremacy of the Ganglion.

L'cirufe's History
  • L is a decendent of the High Entia. L's full name, L'cirufe, is an anagram of Lucifer, who is an angel who was cast away to Hell. The reason for him being linked to the High Entia is now more obvious, as the High Entia are obviously a parallel to angels, which can be seen in their appearance, but it goes much deeper than that. The High Entia lived in Alcamoth, which was the highest point on Bionis, similar to how Heaven is always described as being "above" everything else. Also, the High Entia were said to be the closest race to Zanza (God) on Bionis, much like how the angels are said to be the closest to God, and likewise, both are used by their respective gods for assistance.

Elma's appearance was the inspiration for KOS-MOS's design.
  • Kevin was given the designs by someone who see themselves as "God's messenger" such as someone called "Great One" or "Black Knight" and Kevin was unaware of the origin of the design.

Everyone is able to understand a mute like Cross/Rook because of Mira.

Something was supposed to happen to Gwin between Chapters 10 and 11.
  • Perhaps he was going to be killed or wounded in that time, hence his Affinity Missions suddenly being required to proceed with the story.

Goetia is a Marnuck.

Ryyz is part Terebra.

Ryyz is not dead.
  • While the final scene with her and Dagahn implies destruction, Dhgahn is tough enough to go toe-to-toe with a Skell and win. Ryyz may show up in the sequel, heavily scarred/cybered up, and looking to settle the score with Elma.

The giant rings around Oblivia are the ruins of a planet destroying weapon
Someone previously living on Mira built it. The bottomless pit in Oblivia is a result of it backfiring and shooting straight down.

Mira is Hell and/or Purgatory
It's why the Ganglion can't leave even though they are a space-faring race. Crashing into Mira was described as entering a white light which sounds like how dying is commonly described. L'cirufe is Lucifer, the large goat-horned man with an unusual interest in humans who enjoys making deals. The indigen are demons, which is why so many of them are dangerous and violent, except for the Nopon who are lesser demons that also enjoy bargaining. The Mims are just controlled by the human's souls in the afterlife inhabiting the Mims. Cauldros is most obviously Hell while outward areas are Purgatory.

The Mediators were also under the influence of a hacker (in real life)
  • They used to be the top dog in the rankings, now they frequent at the bottom, not unlike the Prospectors previously.

Elma is a Samaarian, or is at least descended from them
While it is said that humans are descended from the Samaarian, there could still be some out there. It could be one more element of Elma allying with and trying to save humanity, because our race and hers share the same ancestry, and she views humans as family.
  • The technology she brought to Humanity, her appearance being one of the most human looking aliens yet having traits all the other xenoforms lack, and even seemingly knowing about the alien threat that would come to Earth years in advance are strong points of evidence towards this.
    • Also, when Luxaar encountered the group in the Lifehold's core, he managed to figure out by her words that not only was she not like the others, but that her "human birthright" allowed her to sense the Vita was missing something vital. That birthright is likely the DNA failsafe the Samaarians passed down to Humanity.

Eventually, the mimeosomes of NLA will become flesh and blood, even without the use of the Lifehold core
As Elma points out in the game's ending, Mira appears to have powers and a will of its own. And if humanity sustained without the use of the inner Lifehold, it means the planet very clearly is playing in their favor.

Mira is God. Or the living will of the Samaarians. Which is God
While the federation that spun out from them went to shit, the alignment of the ancient Samaarians is a mystery, but their power was incredible enough that they could traverse universes. Luxaar's statements about them imply they aren't around anymore, but considering Mira seems to favor humanity, they could be in control of the planet, protecting their descendants. Taking it a step further, the Samaarians may have had some interactions with humanity back on earth, and over time, were accepted as the gods that formed humanity's religions.

Black Knight's identity
He is Elma's father or he is Elma's partner who was refereed to as the "hero of the White Whale" who co-piloted the original Ares with Elma.

Mira is the planet from Monster Hunter 3
Either at a point in the distant past (during a time of heavy flooding and implying the game's humans were actually Samaarians) or the distant future (after the rebuilt humanity has fully integrated into Mira), we see a more tribal, nature-centric race of humans on Mira. Primordia becomes (or was) the Deserted Island, Noctilum the Flooded Forest, Oblivia the Sandy Plains, Sylvilum the Tundra and Oblivia the volcano.

The Ghosts created or manage Mira
In addition, they were the ones who downloaded all the information of the "sleepers" in the Lifehold Core and are storing or using it somewhere. The attack on the White Whale was primarily a diversion.

The Trigger Scintimure from Bozé's final Affinity Mission is what Lao used to kill his team.
  • During the mission briefing, Bozé mentioned Saiden and Mondo, both of whom happen to be part of Lao's team, were among the casualties fighting this enemy. Note that this mission becomes available after Chapter 9, when the entirety of Lao's team is killed. Who's to say that Lao led them to the Scintimure's den to get them killed, then retreat all the way to the Sylvalum peninsula to meet up with Rook? And who's to say that the Definian involved in the same mission was also involved in this plot?

Lao is the man in the song "Uncontrollable"
Lao's situation with his wife, Charmaine, was not nearly as perfect as his dialogue implies. Like the male lead of Uncontrollable, Lao had grown distant, cold, possibly even abusive, possibly due to his time in the US military. His marriage was already crumbling when The Ganglion war came to Earth. Seeing that everything was falling apart, Lao saw a last chance to save not only the literal life of his family, but the figurative life of them as well. If he could secure them all places on the Lifehold, he, Charmaine and Censhie could be a family again. His decision to betray NLA is not only fueled by their deaths, but by the fact that he was so close to having them back. On top of all that, Uncontrollable mentions, "The key to life," and Lao's final boss theme is "The Key We've Lost."

Black Knight is a lifeguard.

Most of the aggressive indigens on Mira are Ganglion bioweapons.
  • Think about it, is there any other reason why Mortifoles, Tenisculas, Mephites, and countless other Goddamn Bats and Demonic Spiders keep attacking humans? The only example of indigens fighting the Ganglion are the tainted ones in Noctilum, and they're treated as an exception.

The next Xenoblade game will involve Dimension Travelling, or at the very least, ability to travel to different worlds.
Given the series love for extremely expansive worlds, the next logical step after having a giant world is to have several different worlds to explore. Plus, given the hints that Mira has the ability to pull beings from other planets/dimensions to its surface...
  • Maybe Jossed? What little we've seen of Xenoblade Chronicles 2 looks inspired in equal parts by Baten Kaitos and Xenoblade Chronicles. Still time for alternate dimensions to come up.
  • Furthermore, concept art shows a view of Mira from space with ANOTHER SET OF CONTINENTS AND ANOTHER CITY, and a followup to Xenoblade X would be more likely to involve those.
  • And, now that said next Xenoblade has been released, we can say for certain that it's Confirmed. The Zohar-shaped “Conduit" that Klaus/Zanza used to accidentally destroy Earth and create the first Xenoblade's universe is a device/entity/thing/god/Wave-Existence connecting to other dimensions. While so far controlled dimension-hopping is impossible -Klaus tried to do so and ended up destroying his homeworld- the possibility is definitely confirmed as being here Speaking of which…

Mira is (one of) the repository(ies) of the Conduit
Not only would that allow to bridge all episodes its presence would elucidate many unexplained events and mysteries: the Planetnot being on any star charts, people understanding each other despite all speaking in their native languages, the planet managing to trap even the highly advanced Ma-Non, the White Whale crew remaining alive despite the computer housing their memories being destroyed: if the hinted as being sentient multiverse's doorway/keystone is located somewhere on or in the planet, then it makes sense that Mira can rewrite the rules on a whim

Katy Perry's E.T. song is about Elma and whoever loves her.

The Prone has a partnership with the Soylent System
Some of them even work there, it would explain their taste in humans and Citan gave them the idea to use their enemies body parts as weapons.

The Lifehold can still restore everyone completely despite the destruction of it's systems
Despite that the system was destroyed after the White Whale crashed on Mira, everyone's mimeosomes are still running and their personalities and memories are intact, meaning it has no effect on Humanity regaining their bodies. A possible plot point in a sequel could be Humanity having successfully restored their bodies, but Elma, Nagi, Vandahm and Chausson will just be unaware of how, leading to Team Elma trying to discover how Mira managed to keep them alive and possibly why it did.
  • The game itself hints this is probably the case. However, that doesn't account for all the people whose consciousness were still locked away and everyone whose mims were destroyed over the course of the campaign.
    • Though nothing confirms they've been lost either, and Lao's appearance in the final cutscene hints that those who had their mims destroyed or aren't awake are all still safe. It's possible that many had their mims restored off-screen before Elma found out the Lifehold core's actual state just in case any further trouble came up.

The game takes place on/near Mira's equator
Which is why the continents you visit are areas that usually have high temperature.

The events of Chapter 5 resulted in the deprecation of a cultural taboo.
Before the player character finds out about mimeosomes, nobody mentions them beyond vague hints, but afterwards people mention them freely, even though everyone else knew the whole time. It could be that the reason for this was that, prior to the revelation, there was a cultural taboo in place where it was highly discouraged for people to talk about mimeosomes, instead pretending they were entirely human for comfort purposes. Once the main character had their revelation, however, those who knew them realized what a bad idea it was to pretend (in case there were others who were in the player's situation, as well as for the benefit of other species), and the word started to spread that it'd be best to start being more open about mimeosomes.

Mira is a god like the Bionis and Mechonis and that god is the remains of Zanza

Major Xenoblade Chronicles spoilers in this WMG

The unspoilered part isn't much of a wild guess: Mira is implied several times to have a will of its own that is responsible for removing language barriers between all the alien species on the planet, restoring souls into Mimeosomes despite the Lifehold Core being destroyed, and possibly even creating Rook. That sounds on the level of what the Bionis and Mechonis were capable of. Since Mira, so far as we've seen, is shaped like your average planet, it's unable to express itself in the way the two titans can. Hence, why we never see any visible actions by Mira unless Rook is serving as its avatar. It might be a thing in the Xenoblade universe that all planets contain their own god or gods which act(s) as their will.

Now for the wild guess. Mira isn't just any old god: it's Zanza, or a vestigial part of him. Zanza's stated in Xenoblade's endgame to have been motivated in part by a fear of his creations leaving him, robbing him of a food source and kinship. Mira shows similar behavior by pulling in any beings that enter its area of space and refusing to let them leave. This resembles a Giegue-to-Giygas level of degeneration, Zanza having been reduced to a singular desire: keep anything from leaving. Mira also has a Telethia of unknown origin, a creature closely associated with the Bionis and which so far only Zanza has been shown capable of creating. Xenoblade X made sure the player knew of the Telethia's existence in Mira, dedicating a chapter to showing off its power. Why do that for what otherwise serves as a superboss?

If this theory is true, how then did Zanza survive? Shulk was Zanza's vessel for years; maybe after Shulk died, a bit of Zanza that was still with Shulk was returned to the earth, partially regenerating the god. Maybe this development happened naturally over time, Zanza's death greatly reducing his spirit instead of outright destroying it, allowing it to partially rebuild itself over centuries.

Finally, if Zanza/Klaus destroyed Earth, how did it come back to be destroyed again in X's opening? Simple: when the new universe was born at the end of Xenoblade Chronicles, Earth was recreated alongside the planet we see the Xenoblade characters on. The Bionis/Mechonis existed in their own universe, there's plenty of room for both planets.

At some point, the game was a prequel of the originally envisioned Xenogears
The computer that kind of houses the humans' conciousness, Lao, the human exodus and the Skells/Dolls have clear parallels in Xenogears as Deus, Miang, the other human exodus and the Gears. As we know, Monolith soft cannot legally use their old IP so changes were made to keep both franchises legally distinct. You can tell were both games would have fit togheter if they were part of the same continuity, but cannot be in good faith claimed to be part of the same universe except in the broadest of strokes. Which was the carefully crafted true intention.

Cross/Rook's mim is simply controlled by you, the player.
After all, you're the one who decides how they look.

X is meant to be a sort of counterpoint to the original Xenoblade.
Xenoblade was a fantasy game that underwent a Genre Shift to sci-fi at the very end. X is a sci-fi game with a number of events and phenomena that may not be the result of anything scientific. If any continuation of X is made, it will see the story shifting to Science Fantasy.

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