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When we first meet Levi, he's presented as aloof and stoic, scoffing at the crowds cheering him

1. No Regrets isn't written by Isayama

https://twitter.com/whofavoredfire/status/1614430680737542146Levi
https://twitter.com/whofavoredfire/status/1614475769979502592
Erwin and Levi's relationship is something of a full circle, one built on mutual trust, support, and reliance-
https://twitter.com/L_Luck__/status/1575170924935933952AoT cautions many things that culminate in Ymir's character



Most of the cast have military training but Levi began fighting when he was extremely young outside of sparring in life-or-death fights


There are many smart characters in AoT, but Hange's type of intelligence is more scientific, focused on deduction & innovation- the desire to know more & understand defines the character
When passing the torch to Armin, Hange said a Survey Corps Commander has to have an "unyielding desire for broader understanding" 
Armin has dynamics with both Erwin & Levi that have important roles in his arc as he learns to see the value in himself and gain confidence
One of my favorite chapters is #80: "The Nameless Soldiers"
"Midnight Sun" is by far one of my faves because it does so much for the series as a whole (foreshadowing, developments, motifs, etc.) while also being largely character-driven
The no regrets speech is core to Levi's character & the series as a whole because it stresses the importance of choice, making hard calls in impossible circumstances, and living with the consequences of your actions as well as pushing forward rather than dwelling on the past
Erwin's true characterization wasn't conceived until ~50 chapters in, despite technically being in chapter 1



And just a couple chapters before, Levi and Zeke's conversation discusses judgements of each other, assumptions, and concludes with this from Levi:
Further, Kenny and Levi's conversation discuss the Ackermans opposing Karl Fritz (the royal with the Founder's power) because he "didn't want humanity to survive" while the Rumbling is described as the decimating humanity, an unparalleled massacre 


Levi's intro is crucial to understanding his character- we immediately learn what matters to him, how he lives with all the death surrounding him, and how he chooses to live his life.


I had seen speculation on how Levi's refusal to "get with the times" represented by clinging to the old uniform was indicative of his future death or becoming outdated
Erwin and Hange both harbor self-doubt due to the immense responsibility of being Survey Corps Commander (in increasingly difficult times) and their own perceived inadequacies
1. The Characters -


You can't pull off Levi's feats against impossible odds with just strength; brute strength and speed alone aren't much if you aren't perceptive & strategic about how it's used


So I kept seeing claims Levi "doesn't do anything" or is "forgotten" post-time skip but that's not how I felt while reading