Summary
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Zenitsu Agatsuma is a character in Demon Slayer who has not yet reached its real potential in fights.
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A mysterious letter that reveals his master's death changes Zenitsu and helps him find purpose and courage.
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In the Infinity Castle movie, Zenitsu will face its biggest challenge fearless and reach its full potential.
Demon Slayer: Kimetsu No Yaiba Has characters with different backgrounds and social strata that have met tragedies and personal losses that shape their paths. Among the many faces that have carved their place in the hearts of the fans all over the world, Zenitsu Agatsuma stands out as one of the most memorable.
Throughout the series he struggled many exciting fights with his friends, but it always seems that he has barely achieved his real potential in any of them. With the Infinity Castle movie scheduled to be released this year, and given what happened in Hashira Training Arc, it seems that Zenitsu's moment has finally arrived.

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7 Demon Slayers who Dog Fighting Demons
These members of Demon Slayer Corps lost their lives on the battlefield in Kimetsu No Yaiba.
Zenitsu Agatsuma: The Sleeping Warrior
Jigoro Kuwajima's disciple is a ruthless fighter when his instincts take over
Zenitsu Agatsuma seemed unsuitable for Demon Slayer Corps when he debuted in the series. Slightly overwhelmed, always complaining and afraid to fight demons, he came across as an unreliable companion for Tanjiro and Inosuke, who were both always prepared to put their lives on the line for the best.
I hate myself more than anyone else. I always think I have to gather my action, but I end up smashing, running away, sniffing. I want to change. I want to be a competent person.
Interestingly, when Agatsuma showed glimpses of his potential, public opinion swung to his advantage, and many fans of the series changed their opinions. It is strange that he did not change much as a character, but when his instincts took over in a conscious state, Zenitsu seemed invincible, as if he were a completely different person. His unstoppable combat ability during the seasons has received him praise from the viewers, who want to see him develop into a fearless version of himself. But will it ever happen?
How Infinity Castle will reveal Agatsuma's real potential
Losing his Lord will free Zenitsu from all his fear
Until Hashira Training ARC, Zenitsu shown glimpses of greatness in several fights during the seasons, but he hardly changed as a person. His cowardice and shyness turned off a lot of viewers, who just can't tolerate him. At the same time, fans who liked him expected to see a more fearless and reckless version of him, which unfortunately did not happen the longest. In addition to the glimpse of greatness, Agatsuma was hardly developed. While he might have improved as a fighter, he still seemed completely lost as a person and hardly showed any desire to fight or even exercise.

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Demon Slayer: This Hashira has the darkest backstory
No other Hashira has suffered as much personal loss as Gyomei Himejima.
But all this changed when he received a mysterious letter when he trained under Stone Hashira Gyomei Himejima. As always, Agatsuma had detracted every moment of training with Hashira until that point. He continued to complain and try to escape. But as soon as he read the letter, something changed inside him. In a moment he was no longer the person he once used to be.
Zenitsu isolated himself and hardly ate anything when he meditated and trained alone, lost in his inner world. Even when Tanjiro visited him, he barely talked to him and refused to eat the food he offered. Usually, Agatsuma would have complained about extreme training conditions and made a huge scene of the harsh situation, but he no longer mumbled despite the bleeding plenty of his head. But what would have led to this dramatic change?
For most of his career as a demon Slayer, Zenitsu struggled to find a meaningful reason to push himself or put his life on the line. While he stood up for the greater good in his unconscious state, he hardly showed any desire to fight when he was back in his mind. But when the mysterious letter revealed to him that his champion Jigoro Kuwajima had committed Seppuku, he could not come to terms with the news of his death.
It was a bowel -changing reality that made all his fear and complaints irrelevant. The only person who stood for him no longer lived, and Zenitsu now wanted to be avenged his death desperately. What made Jigoro's death so painful is that a person close to his master had not only betrayed his values but also back stabbed him in the worst possible way that can be imagined.
This is my shape. I created it, so it's all mine. With this technology … I wanted to fight you as an equal!
Driven by this desire for revenge, when Zenitsu entered Infinity Castle, he no longer cared what would happen to him. All the fear of death was gone, and he could fight without going into his usual unconscious state. For the first time in his life, Agatsuma had a purpose, something he had to do at all costs.
In the film movie Infinity Castle, he is prepared to enter the extra-dimensional space created by Nakime to follow the person responsible for his master's unclear death. But this battle will be unlike everything he has struggled in his life because he no longer fears to die or be seriously injured. Zenitsu is expected to reach its full potential and exceed all expectations for his biggest challenge yet. Infinity Castle Movie will have a lot of memorable moments and Agatsuma's fearless battle will surely be one of them.

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