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troperville

This is a "Wild Mass Guess" entry, where we pull out all the sanity stops on theorizing. The regular entry on this topic is elsewhere. Please see this programme note.

Fate Kaleid Liner Prisma Illya

Fate/kaleid liner PRISMA☆ILLYA

Sudden drops in magic power are partially because of Zeltrech's Gem Sword

From time to time, characters comment on how a magical attack isn't nearly as strong as it was a few panels ago. This is because Zeltrech's Gem Sword, which drains mana from its alternates in other universes is doing its thing in Another Dimension. Kaleido Ruby and Kaleido Sapphire being components, and having no problems at all firing gobs and gobs of mana are prime targets.

The series is set after a successful Holy Grail War

One where Ilya got her wish. In the Ilya route in which this occurs, the only survivors were Shirou and Ilya herself; Ilya, wishing them both to be happy, created a new universe where everybody didn't have horrible backstories, and all the dead people, well, weren't dead. The new universe contained many of the concepts of the old, in new forms. In the process, she sealed away both her and Shirou's memories, and entrusted their guardianship to her creepy maids.

Which means basically that the Grail Conduit wished for the power to keep existing; thus Ilya retains a connection to the Akasha. Normally the Wish would be able to handle this; but the rule-breaking aspects of the Kaleidostick are massively screwing with this.
- The Corruption of Angra Manyu had to be sealed away into the Cards.
  - So very close. It's The result of Ilya's parents saying "screw it" to the Holy Grail War to begin with, and sealing the power so it doesn't wake up. However, being connected to the Akasha did give them the power to grant Wishes still. Of course, this reality could have been created through Time Travel via the above theory.

Black Ilya is to Illya as Archer is to Shirou

She came from the future where Illya is able to fully utilize the power mentioned by Sella to be sealed inside her 10 years ago. It causes problems for her in her future and she somehow dies in a fashion similar to aforementioned hero with a tragedy to boot. She was then summoned by the Archer card as a Heroic Spirit and tries to kill Illya and stop the tragedy from happening. She also came to love Miyu, thus her lack of embarrassment from kissing Miyu to drain her mana, ~~possibly~~ enjoying it.

She obviously also still has a thing for Shirou.
- Jossed. Kuro is born from Illya memories when she's 8 month old.

Black Ilya

is actually the Ilya from the doujin Sword Dancers I mean, look at the resemblance!

Heroic Spirit EMIYA will show up

Because this storyline needs more GAR.

Isn't Kuro effectively EMIYA in Ilya's body? Not that I'd complain if EMIYA showed up, too.

Ilya and Shirou's parents are looking for a cure for Ilya

Related to the "sealed power" within her, that's why they're gone all the time.

I Knew It.

Miyu is a magical copy of Shirou's biological sister and Homunculi

After Kaleidoscope Ruby sought out Ilya; Luvia Edelfelt realized that Kaleidoscope Sapphire was going to do the same thing. Instead of just finding out who it picked and bullying them; she got a little proactive. She created a being with the aspects that Sapphire would most be attracted to; and programmed her to obey her. The person she based the Homunculus on was randomly one of the people who died in the fire that made Shirou an orphan. When she realized just who she copied; she told Miyu not to tell Shirou. Shirou has amnesia of his life before the fire; and this was the age his sister was when she died.

Black Ilya does tell Miyu that her existence is similar to her own; born of magic.
- Of course, this means her lifespan should be very short; but chances are this series will find a way to fix that.
  - Revision! Miyu's brother is the Shirou from her Alternate Universe. Nevertheless her counterpart in the Prisma-verse (and Fate/stay night) was also likely Shirou's sister before the fire.

Ilya was the vessel for the Fourth Grail War.

For some reason, the souls of the defeated servants was transferred to Ilya instead of Irie, and she become the vessel. Thankfully, Kiritsugu managed to kill Kotomine after the great fire, win the war and had the Mage Association save the barely alive Ilya and dismantle the Grail. Unfortunately, remnants of the grail and its corruption still reside in Ilya, so her parents search for a permanent solution across the world, leaving her under the care of her Homonculi maids and a survivor of the great fire that they had just adopted.

Possibly confirmed.

Black Ilya is the same Ilya Archer knew during his life time.

We know that Ilya died a year after the war in Archer's time, but perhaps Shirou tried to save her life by transffering some his power to her. This caused her to begin exhibiting powerful projection abilities and her skin turned darker (like what later happened to EMIYA). At some time before she died she used these abilities to do something incredibly badass that ended up netting her a place in the Throne of Heroes until she some how got dragged into this reality. This of course means that if Heroic Spirit Emiya shows up later in accordance with the above we can be expecting a a very touching reunion.

Sakura will play a role in the third story-arc.

Sakura will show up as a Dark Magical Girl rival to the heroes a la Fate Testarossa, and she will have her shadow powers and obscene healing factor. She will eventually get "befriended" by Illya, will become a permananent resident of Shirou's harem, and the people who manipulated and tortured her into doing what she did will get their comeuppance. A possible Kaleid Liner Prism Illya 3rei! in a nutshell.

And Counter Guardian EMIYA shows up as well, to make the story even more badass.
Well, Sakura indeed has appeared in an Omake, but we'll have to see if she's only a one-chapter character or will become an recurring character.

Matou Zouken created the cards.

In the classic Fate timeline, he is the one that created all of the servant-binding spells, including the class system. So it makes sense that he made the class cards in this one. This could be relevant if combined with the above theory, as Matou Sakura might be able to use the cards in some special twisted way.

Miyu's brother is the Big Bad

Major spoilers for the end of 2wei. There are heavy implications that Miyu's brother is someone very similar to Shirou. And with revelation that Miyu is from an parallel world, it is possible her brother IS (an alternative) Shirou Therefore it is possible that Miyu's brother is the Shirou who wants everyone to be happy. So 'his last wish' to Miyu for her to escape to another world where she can be happy and not suffering, is actually a Gambit Roulette like Fei Wong Reed that Miyu travel to another world and learns happiness and then he will use her experience with happiness and her role as a Holy Grail Vessel to wish for EVERYONE to be happy!

After all, in Carnival Phantasm, the preview to 2nd season of Phantasmoon hints of Shirou as the Big Bad, it was actually foreshadowing to Prisma Ilya.

Miyu's brother is Shirou in her world, he's in a cell by the Ainsworth's and tortured. If this WMG is true then he's very sneaky.

Rin and Luvia being chosen to wield the Kaleidosticks in the beginning was Zeltrech being a Troll

Who in their right mind would think those two would be able to work together? In what universe is that even possible. So why did he do it? Well, this troper has heard Zeltrech is pretty awesome, so I figure he somehow knew that better candidates would be living in Fuyuki, and sent them there knowing that the Sticks would eventually ditch them. He then sits back and watches the two screw around and gets some laughs in the process.

Rin's parents don't know she is in Japan cause she doesn't want them too

Seeing that there is no Grail war, Tokiomi and Aoi should be alive and well. Sakura also doesn't seem to be Rin's sister here either. Rin comes from a fairly wealthy Mage family so why is she willing to work for Luvia who she hates? Rin dislikes the spoiled rotten attention she gets from her parents being thier only child. However either Aoi or Tokiomi will catch wind that thier precious daughter is working as a maid for one of thier biggest rivals... Hilarity ensues!

Rin, Sakura and Illya will all get a big damn Heroes rescue by thier appropriate Father figure!

Rin will be saved by her Dad, Sakura by Kariya, and Woe to the poor fool who tries to take Kiritsugu's baby girl!

Parallel World Shirou will teach Kuro Unlimited Blade Works

Now that they've been sent to an alternate dimension in Drei, some things are going to be different. IF this world's Shirou is alive, then he may be able to show Kuro the true abilities of the hero EMIYA. She'll also probably have her own custom invocation related to her existence and/or The Power of Friendship.

Possible. If they can break him out of his prison though. The possible part comes from his appearance, even though it was very short: Patch of dark skin, a few strands of white hair...

Parallel World Shirou is a lolicon

Because hell, it might be true.

Parallel World Shirou is a womanizer

Following that the parallel world is a reflection of Illya's world, the blind and dense Shirou would be one hell of a Casanova

Shirou isn't as unaware of magic as he lets on

It's just that Kiritsugu has told him to keep it a secret from everybody. After all, Shirou is the eldest child in a mage family, so it's plausible that he'd actually have learned at least that magic exists from his father.

Beatrice's Beserker install power is Thor

Beatrice's install formed gave her a massive Hammer which is Mjonir, She is able to increase the size of her limbs, Thor had to shapeshift so he could be with his giantess lover, and when She and the Other girl appeared A Bolt of lightning took the group down but the other girl didn't have a spirit installed since she turns into a female Gilgamesh upon landing!

The Familiar Of Zero

WMG/Anime And Manga

Fireball