Tanjiro's development in this arc feels overshadowed by the actual mechanical conflict with Gyutaro and Daki, to be honest. He's got that whole 'breath of the sun' lineage reveal, but the narrative doesn't give him enough space to process it before throwing him into another fight where his primary role is to endure. His growth is reactive—he survives because he has to protect Nezuko, not because he achieves some new philosophical mastery. The real character work is on the Upper Moon demons themselves, especially Daki's parasitic dependence and Gyutaro's bitter, protective rage. Their tragic backstory, forced into demonhood by poverty and cruelty, creates a more compelling conflict than Tanjiro's standard shonen perseverance. It flips the script, making you understand the villains' monstrous bond while the heroes just try to smash through it. I kept waiting for Tanjiro to have a moment of genuine connection or pity before the final blow, something beyond just recognizing their suffering, but it all gets buried under the flashy animations and battle sequences. The arc is visually stunning, but for character depth, it leans heavily on the antagonists' tragedy rather than the protagonist's internal journey.
Zenitsu and Inosuke get more interesting incremental shifts. Zenitsu's unconscious mastery of his skills while asleep is a funny gimmick that starts to wear thin, and his waking moments of courage here feel like a rehash of earlier beats. Inosuke's realization about his flexible body and his competitive drive with Tengen show a sliver of maturity, but it's mostly physical adaptation. Tengen Uzui himself is the wild card—his flamboyance masks a deep, pragmatic weariness. His conflict isn't about getting stronger; it's about confronting his own limitations as a human, his past failures with his wives, and deciding what 'flamboyance' truly means when survival is on the line. That's a more adult form of growth, honestly. The arc's strength is in these sidelong glances at different kinds of strength and sacrifice, even if the main trio's progression feels a bit formulaic this time around.