Louanna is the strongest character in the world of Re: Zero.
No, this isn't a crack theory. Let me cook.
For some context, let me reintroduce who Louanna is because no one read side stories.
Louanna Astrea, mother of Reinhard van Astrea and wife to Heinkel Astrea. Her only role in the story so far is to make the family drama worse by sleeping. She got this Sleepy Beauty condition which is NOT the same thing as being Gluttony'd. She has been sleeping for 18 years since Reinhard was 2 (as of arc 8).
As we all know, Reinhard is stated to be the strongest character by Tappei Nagatsuki in a Q&A (I use his full name here so it's more intimidating). And we all know how reliable the Q&A are with the existence of arc 7+1.
Tappei might not be lying straight up, but he could have been easily saying a half-truth because he is Echidna. (the only way to write a manipulative character is to be manipulative yourself)
Reinhard IS the strongest character, but only among the ones who are awake.
Reinhard's secret to his power has never been explained in the series other than Od Laguna simping over his rizz. We are supposed to take that as face value and believe it.
This is a trap set by Tappei. He wants all of you to think this way. Wakey wakey.
Reinhard is strong because Louanna is strong, this is all genetic. Have you ever wondered how this pathetically weak drunkard has a son this strong? Louanna is strong, that's why.
Tappei has been hiding her lores in the side stories because she is going to be as important as Clind, the holder of the Melocholy WF.
In fact, judging from how much Tappei is holding up her lores, it is not a far stretch to say that she have a bigger reveal. Which is that she is stronger than Reinhard, a character we all already knew to be the most powerful.
Q: "But dude, if this rando plot device vegetable is really the strongest, how did she even get the coma sickness?"
Reinhard has been stated to be a monster in the series for multiple times, it is often to describe his monstrous strength to be inhumane.
But what if it was to taken literally?
Reinhard isn't actually a human, because he IS a monster. Well, half-monster to be precise.
While Heinkel is a pathetic weak normie human, Louanna is an actual monster. She has even been alive to witness the Witch of Envy devour half of the world, in fact, she is Flugel. (But that's another post for another day.)
Louanna is at least 400yo, so her flow of time is different from normal humans. That's right, her 18 years of slumber is not a condition or anything, she was merely napping. So stop trying to cure her, stupid Heinkel, she is fine.
Still in doubt? Look at Heinkel. He's so durable in the story. He has survived too many blunt attacks to still be living. Do you know why? Louanna trained Heinkel well during the three years she was married to him and awake.
She constantly beat up Heinkel, hence strengthening his durability. Yes, I believe that Louanna is a husband-beater, judging by the personality of Flugel according to Shaula.
We all know that Heinkel is Isekai Subaru, and we all know how affectionate Subaru becomes with his abusers. That's why Heinkel still loves Louanna and tries to 'cure' her. He loves being beat up.
From a bad master to a bad mother. Flugel is male, you say? She can shapeshift, she is the strongest after all. In fact, she is Pandora. Have we seen Pandora and Louanna in the same room before? No, we haven't. Louanna=Flugel=Pandora.
TL;DR: Stop claiming Reinhard or Satella or Regulus or Subaru or Petra to be the strongest, Louanna is. Stop coping. See the truth, dude.
