One of Demon Slayer's best rivalries is between Kaigaku and Zenitsu. They are both thunder breathing users, but they have radically different beliefs and goals.
As the plot thickens, Kaigaku and Zenitsu find themselves facing one another in a life-or-death match where only one of them can come out stronger.
Spoiler Warning: This article includes spoilers for the Demon Slayer manga, so proceed with caution.
How Strong Is Kaigaku in Demon Slayer? Abilities Explored
Even before he became a demon, Kaigaku was an accomplished demon slayer who could use all six forms of thunder breathing except the first.
In fact, Zenitsu respects and admires Kaigaku, although many demon slayers believe that all of his efforts will be futile if he fails to master the first form of thunder breathing.
Despite this, Kaigaku was confident in his ability to hunt demons, even going so far as to pursue Kokushibo to fight an upper moon that could turn him into one of the Hashira and silence the naysayers.
After losing against Kokushibo, Kaigaku withdrew from the Demon Slayer Corps and transformed into a demon by taking in a large amount of Muzan's blood.
As the days passed, Kaigaku learned how to incorporate his blood demon art, electrokinesis, with thunder breathing techniques.
As a result, Kaigaku can carry out five consecutive assaults in a single breath and blink of an eye, as well as slash and burn flesh.
Kaigaku also consumed countless humans to strengthen himself even further. All of this led Kaigaku to believe that he was superior to Zenitsu in all ways.
So, Is Kaigaku Stronger than Zenitsu in Demon Slayer?
Despite turning into a demon, Kaigaku is unable to defeat Zenitsu in Demon Slayer, indicating that the latter is still stronger than the former.
However, if Kaigaku had faced Zenitsu a year later, the outcome would have been different, at least from Yushiro's perspective.
Kaigaku could have easily killed Zenitsu if he had been able to grasp his new techniques and skills in time.
But, in reality, Zenitsu unleashed the seventh form of thunder breathing, which he invented himself, to get rid of Kaigaku for good.
Still, Kaigaku demonstrated his power to Zenitsu. He was able to land some vicious attacks on Zenitsu, and if it hadn't been for Yushiro's demon styptic (which Tamayo devised to prevent the advancement of blood demon art), Zenitsu's wounds would have opened up to his eyes, killing him in the process.
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