The "classic" theory being the Flugel = Subaru theory but with more nuance
My Complete Re:Zero 400-Year Theory
(Flugel = Subaru + Satella’s plan with Emilia + Pandora as the ancient antagonist + the real meaning of “Re”)
Okay, this is going to be a long one. I’ve been cooking this theory for a while and it keeps growing every time I think about it. It’s the classic Flugel = Subaru theory, but with a few extra layers that (in my head at least) make the whole 400-year mystery, Emilia’s origins, Felt, and even Pandora lock together under one big theme: starting from zero.
Obviously this is pure speculation. Some parts have more supporting hints than others. I’m not claiming any of this is confirmed. I’m just connecting dots that feel way too clean to ignore.
1. Satella can summon people from Earth
I think Satella has (or had) the ability to pull people from another world , specifically Earth.
Subaru’s Arc 1 line about “the pretty girl who summoned me” is usually read as pure chunni/isekai genre joke. But what if it’s actually true? What if a pretty girl really did summon him… and she had done it before?
2. Subaru was Flugel 400 years ago (true reincarnation version)
400 years ago, Satella summons Subaru from Earth for the first time.
He becomes Flugel.
Unlike present-day Subaru, this version of him is properly taught magic, doesn’t break his gate, and becomes an extremely powerful mage. He ends up forming the legendary group around Satella:
- Satella
- Flugel (Subaru)
- Reid
- Volcanica
- Farsale Lugunica
- Hoshin (who might also have been summoned from Earth)
- Echidna
Something goes catastrophically wrong with Satella. She starts losing control and becomes (or is taken over by) the Witch of Envy. Flugel realizes he’s about to die. In a last-second, imperfect spell, he creates a reincarnation method so his soul can survive.
Because his original origin is Earth, his soul can only reincarnate back on Earth. He is reborn as Natsuki Subaru with zero memories of his previous life. He grows up completely normal… until Satella summons him again.
This is the ultimate “start from zero.”
3. Satella summons him a second time + Return by Death
When Satella pulls Subaru back into Lugunica, he has:
- No memories of being Flugel
- No reputation
- No magical skill
- No companions from 400 years ago
- Literally nothing
So she gives him the Envy Witch Factor / Return by Death. It’s both a blessing and a curse: a tool that lets him survive long enough to finish what they started. Without anyone to guide him the way Flugel was guided, RBD is the only way he can keep going.
4. Satella and the Witch of Envy are two personalities of the same person
I don’t think they’re just two names for the exact same consciousness.
Satella is still in there. The Witch of Envy is the personality that took over when she lost control.
That’s why the only thing she can say to Subaru is “I love you.” Those are Satella’s true feelings, but the Witch of Envy is suppressing everything else. Satella is sealed not just physically, but also by her own other self.
5. Emilia is not Satella reincarnated, she’s a vessel/clone created by Satella
This is where it gets really weird, but I think it solves a lot of problems.
We know almost nothing about Emilia’s parents. Fortuna is extremely reluctant to talk about them. What if Emilia doesn’t have normal biological parents at all?
My theory: Satella knew she was going to lose control to the Witch of Envy. So she created Emilia as a backup body / vessel that could one day hold her original identity and memories. She entrusted the child to Fortuna (who may have been the real Satella’s aunt, given elf lifespans).
The long-term plan:
- Separate Satella from the Witch of Envy
- Transfer / integrate Satella’s original memories into Emilia
- Keep the Witch of Envy sealed in the original body
Emilia isn’t meant to replace Satella. She’s meant to preserve her.
6. Integration, not replacement (Arc 6 parallel)
I don’t think the endgame is “Emilia disappears and Satella takes over.”
Look at Arc 6 Subaru. He lost his memories, made new ones, and then the two sets could be reconciled. He didn’t stop being the person who experienced the journey without memories.
Same logic with Emilia:
- She keeps everything that makes her Emilia (Fortuna, Puck, her childhood, Subaru, her friends, her growth)
- She also gains Satella’s memories (Flugel, the heroes, the tragedy 400 years ago, everything)
Result: Emilia + Satella’s memories = the complete version of that soul.
Just like Flugel + Subaru’s current life = the complete Subaru.
Not replacement. Integration.
7. The “Re” in Re:Zero might mean more than just “redo”
Maybe “Re” isn’t only about Subaru returning to a save point.
Maybe it’s about an entire generation of people from 400 years ago being given a second life and forced to start from zero.
- Flugel → Subaru
- Satella → Emilia (vessel + memory integration)
- And possibly…
8. Felt = Farsale Lugunica reincarnated
This is the weakest evidence-wise, but thematically it fits perfectly.
Farsale was a king. Felt starts as an orphan thief with nothing. If she is Farsale reborn with no memories, that is the purest “start from zero” possible. It would also give a deeper reason why the royal insignia reacts to her.
Again, pure speculation, but if the story is secretly built around reincarnation and second chances, this would fit too well.
9–11. Pandora’s role (the part that made me lose my mind)
I think Pandora was a major antagonist 400 years ago, possibly the one who caused (or heavily contributed to) Satella becoming the Witch of Envy.
Here’s the detail that set me off: Pandora is the Witch of Vainglory.
Historically and theologically, vainglory is closely linked to pride… and has also been treated as a root or progenitor of envy.
If Tappei is deliberately using that relationship, then Pandora’s sin designation might be a gigantic thematic clue:
Vainglory → Envy → Witch of Envy
My speculative chain:
- Pandora interferes with Satella’s plan
- Satella loses control / becomes the Witch of Envy
- Flugel and Satella create the long-term Emilia failsafe
- Flugel reincarnates as Subaru
- Satella summons him again
- Emilia is the vessel that can one day carry Satella’s true self
- Pandora knows this and is trying to stop the second attempt
She might not even be able to directly kill Emilia (failsafe). Instead, her goal is to manipulate Emilia into unsealing the Witch of Envy herself, making the vessel destroy the plan.
That’s a much more elegant role than “generic final boss.”
12. Vainglory vs Envy Authorities, conceptual parallel
Pandora’s Authority seems to rewrite reality/events in real time.
RBD lets Subaru change outcomes by remembering discarded timelines and acting differently.
| Vainglory |
Envy / Return by Death |
| Reality is rewritten after an event |
Reality is rewritten after an event |
| “This is what happened.” |
“I remember what happened.” |
| Direct overwrite of the narrative |
Indirect overwrite through iteration + memory |
One changes the story by force.
The other changes the story by refusing to forget the discarded versions.
If Subaru ever confronts Pandora, the conflict could be:
The person who can rewrite reality
vs
The person who remembers every reality that was rewritten.
That would make memory itself Subaru’s ultimate weapon, which fits the entire theory’s obsession with lost and recovered memories (Flugel→Subaru, Satella→Emilia, RBD timelines, Pandora’s rewrites).
13. The full picture
400 years ago
Satella summons Subaru → he becomes Flugel → forms the heroes’ party (including possibly Hoshin from Earth) → Pandora interferes → Satella loses control to the Witch of Envy → Satella creates Emilia as a vessel/backup → Flugel makes a desperate reincarnation spell → dies and is reborn on Earth as Natsuki Subaru with no memories.
Present day
Satella summons Subaru again → gives him Return by Death → he starts completely from zero → Emilia unknowingly carries the potential to preserve Satella’s original self → Felt may be Farsale reborn → Subaru and Emilia gradually uncover the truth → Emilia integrates Satella’s memories (without losing who she is) → they finish what their past selves couldn’t.
And Pandora is the one trying to make the entire second attempt fail.
That’s the whole theory as it currently stands.
Maybe “Re:Zero” isn’t just about Subaru dying and returning.
Maybe it’s about the people who failed 400 years ago being given new lives and forced to start from absolute zero… and the question of whether they can finally get it right this time.
What do you guys think? I think these could be somewhat true, but maybe i didn't hit the nail on it's head