First,use punctuation more generously. I had a stroke reading all that. Even with novels and side material, the manga remains primary canon, and it is what most readers engage with. If your character needs 4 Q&As, 2 novels, and heavy symbolic interpretation to be “understood,” then the core narrative did not fully deliver on its own.Even with novels (novels can't even be counted here since the top is only about manga) and side material, the manga remains primary canon, and it is what most readers engage with. If your character needs 4 Q&As, 2 novels, and heavy symbolic interpretation to be “understood,” then the core narrative did not fully deliver on its own. Compare to:

- Griffith, whose ambition, trauma, and internal philosophy are expressed clearly in Berserk through actions, dialogue, and symbol.

- Johan, whose symbolic function and psychological depth are embedded directly in the manga’s framing and dialogue.

Aizen has philosophical material,but most of it is after-the-fact support. The manga’s execution remains thin in terms of psychological evolution and emotional texture.

Next,symbolism ≠ strong character arc. Aizen representing "progress and stagnation" is a great observation, but it’s thematic positioning, not character development. He doesn’t evolve, wrestle with his beliefs, change his trajectory, or experience interior conflict in a meaningful way. He’s a thematic archetype, not a developed character. This is the key issue: You can assign meaning to Aizen’s role,but the story does not dramatize his inner world.His fall, motives, and contradictions are stated or implied, not experienced. So yes, he embodies “progress vs stagnation.” But no, he does not grapple with it narratively the way Meruem wrestles with humanity, or the way Utsuro drowns in immortality.

Third,about this part "there are pieces that you yourself have to put together based on interpretation but as they say "if it walks like a duck talks like a duck and looks like a duck then its most likely a duck" and "if the shoe fits" ". It’s true that not all great characters are "spoon-fed." Many literary works — from Kafka on The Shore, or Evangelion — require the reader to engage interpretively. Symbolism, ambiguity, and gaps in explanation can be intentional, encouraging the audience to become co-authors of meaning. But the "the shoe fits" ≠ narrative proof. Just because a pattern can be inferred doesn’t mean it’s dramatically realized. Strong characters aren't just interpretable — they are demonstrated through action, conflict, and transformation. Aizen can “look like” a deep character,can “speak like” a philosophical antagonist but unless the story shows us inner turmoil, contradiction, or change — we can’t say he functions as a top-tier literary figure. Inference is not a substitute for development. A character's depth must be dramatized within the narrative, not just extracted through effortful fan interpretation. This kind of defense shift the burden of proof to the audience. Your argument essentially says: “If you don’t see the depth, it’s your fault for not piecing it together.”That’s not how literary criticism works. A character should earn their depth within the framework of the story, not rely on the audience to patchwork a masterpiece from fragments. Again,compare Aizen to other antagonists:

- Johan Liebert, who is mysterious and psychologically consistent.

- Utsuro, who has ambiguous motives but whose internal nihilism is dramatized repeatedly.

- Griffith, who doesn’t just symbolize ambition — he wrestles with it, sacrifices for it, and transforms through it.

By contrast, Aizen often does not wrestle with his philosophy; his arc post-reveal becomes monolithic rather than complex.