Muzan Is the Weakest Part Of Demon Slayer’s Final Arc — Here’s Why

Pavas Gagneja
Jul 2
3 min read

SPOILER ALERT: This article contains major spoilers from the Demon Slayer manga, including shocking plot points, final battles, and major plot twists not yet covered in the anime. Proceed only if you're caught up or don't mind having key story elements revealed.

Muzan should have been the biggest and most terrifying threat in the story. After all, he’s the first Demon, the creator of every other Demon in the series, and the reason for all the pain the characters go through. But when we finally reach the Final Arc and see him in action, something just feels off.

The build-up to Muzan was amazing. He was always in the shadows, mysterious and powerful, with a creepy calmness that made him so scary. But once the final battle starts, his character becomes less interesting. Instead of a smart, terrifying mastermind, he becomes a screaming, angry monster. And for many fans, that shift made him the weakest part of an otherwise amazing ending.

ALSO READ: Strongest Demons In Demon Slayer, Ranked

Muzan’s Character Stopped Growing

Muzan expermenting to make the Blue Spider Lily

One of the biggest problems with Muzan in the Final Arc is that his character stops developing. At the start of the story, he’s clever, calm, and almost god-like in how he controls everything from behind the scenes. But once he starts fighting the Demon Slayers directly, he just turns into a monster who wants to survive at any cost.

He doesn’t show much emotion or depth anymore; just fear, rage, and arrogance. We don’t learn anything new about his thoughts, regrets, or real motivations in the final battle. He becomes one-dimensional, which is disappointing for a villain who had so much build-up. Compared to characters like Akaza or Kokushibo, who had emotional and layered backstories, Muzan feels flat.

The Final Fight Felt Dragged Out

The Demon Slayers trap Muzan and Gyomei beheads him

The final fight between Muzan and the Demon Slayers should’ve been the most intense part of the series. But instead of feeling epic, it feels a bit too long and repetitive. Muzan’s body keeps changing, he keeps healing, and the Demon Slayers just keep trying to slow him down until sunrise. There’s tension, yes, but not much emotion or surprise.

Also, since Muzan doesn’t have any real connection with most of the Hashira, the emotional weight just isn’t there. With other battles, like Rengoku vs. Akaza or Tokito vs. Gyokko, we cared deeply because of the characters’ emotions. But Muzan’s fight is mostly just about time, not feelings. It starts to feel more like a long boss fight than a final emotional moment.

Muzan Was Missing A Personal Rival In Demon Slayer

Another reason Muzan didn’t hit as hard in the Final Arc is that he didn’t have a true rival. For instance, Tanjiro has a motivation to defeat him, but Muzan doesn’t even care about Tanjiro personally. Unlike Naruto vs. Sasuke or Goku vs. Frieza, there’s no real connection between the hero and the final villain.

Yoriichi was the only one who truly scared Muzan in the past, and that story was amazing. If Muzan and Yoriichi had met again somehow, maybe through Tanjiro or a memory, it could’ve added much more depth. But Muzan just treats everyone as insects beneath him. And that makes the final battle feel cold, instead of personal.

Final Verdict: Great Villain, Weak Ending

To be clear, Muzan is not a bad villain. He had a great design, terrifying powers, and caused so much destruction. But in the Final Arc of Demon Slayer, he just didn’t deliver the emotional or dramatic ending that fans were hoping for. He became less of a character and more of an obstacle.

That doesn’t ruin the series at all; Demon Slayer is still one of the most powerful and beautiful anime stories out there. But if Muzan had been given more depth, more personal moments, and more growth in the end, the final fight could’ve been unforgettable. Instead, he ended up being the weakest link in an otherwise incredible finale.