Writing Quality: Amazing, almost no errors or typos, and it reads fluently. 5/5
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Updates: Pretty quick considering the length of the chapters, -/-
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Story Development: Here's where personal preference comes in, or why I rate it slightly lower than I usually would.
The start was amazing, no doubt about it. Still, the story direction was affected by what the MC was turning into, perhaps to a very high degree, which derailed much of its potential toward a full villain-sided story. 3/5 from me, sorry.
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Character Design: In all honesty, the MC's personality is what made this story.... not something I looked forward to reading once I saw there was an update. It singlehandedly destroyed my interest to see him grow, become stronger, and thrive in the danger he exposed himself to. It all turned the MC into some kind of second-rate murderhobo whenever possible. I do understand how you wrote the character, I truly do, but when at every turn things are resolved with slaughter and mayhem and chaos, it quickly turns stale. (This is only my personal view.)
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World Background: One-Piece world, what more do I have to say.
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Overall: Great, but not my cup of tea. Highly recommend people to at least check it out and make their own opinions.