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Kaigaku was the former disciple of the Thunder Breathing Hashira - Jigoro Kuwajima along with Zenitsu. A talented former Demon Slayer, Kaigaku was not satisified with his abilities and wanted to become stronger. This is when he gave up his humanity and chose to become a demon.
Unlike Zenitsu, Kaigaku was able to learn almost all the Thunder Breathing techniques, but he was also arrogant and proud. After becoming a demon, Kaigaku became even stronger with increased speed, endurance and Blood Demon Art. His Thunder Breathing became more dark energy, making it even more powerful with a demonic twist because of his new form.
Kaigaku’s Thunder Breathing and Demonic Evolution
From Demon Slayer to Demon, Kaigauku Chose Evil Over Good
As a demon, Kaigaku’s body adapted to enhance his combat style and his Thunder Breathing also became more lethal. Because he was now a demon, he also got trademark abilities such as regeneration and enhanced durability, making him a powerful force to deal with. His Thunder Breathing style now infused hisBlood Demon Art gave off dark lightning, allowing him to unleash attacks even more powerful than his original Thunder Breathing form. Even stronger members of the Demon Slayer corps members would find it difficult to keep up with Kaigaku’s speed and power along with his electrified demonic attacks.
In order to get even stronger, Kaigaku devoured a lot of humans, this along with Muzan’s blood, gave him the edge he needed to become stronger. As the former protégé of Jigoro, Kaigaku possessed exceptional swordsmanship with amazing skills in Thunder Breathing. Because of his Blood Demon Art, Kaigaku’s swordsmanship was enhanced even further, making him even more dangerous. Because of his adaptation to Blood Demon Art, Kaigaku even stated that he was able to surpassThunder Breathing because of his abilityto manipulate actual lighting and electricity. No matter how skilled Kaigaku became, he was unable to learn the first and most fundamental form of Thunder Breathing - Thunderclap and Flash. Even though he could execute all five other techniques of Thunder Breathing, he lacked the most important one. His rival, Zenitsu was able to only learn the first form and master it to perfection. It is speculated that this is what led to Kaigaku’s downfall. Zenitsu was able to use a variation of the Thunder Breathing - First Form to his advantage to take down Kaigaku.
I don’t care! So what? Are you saying I should be sad? That I should repent? I don’t care about anyone who doesn’t value me! At every moment I always serve those who know my value.
Kaigaku’s Blood Demon Art - Electrokinesis
Was Kaigaku Truly A Powerful Demo?
Kaigaku’s Blood Demon Art was known as Electrokinesis, which complemented his Thunder Breathing, giving him the ability to use special electrokinetic abilities to generate and manipulate black colored lightning from his flesh and blood. This type of Blood Demon Art is extremely lethal as he is able to create a special effect whichcracks into an opponent’s fleshand causes heavy burns. Similar to the demon who transformed Kaigaku (Kokushibo), Kaigaku also possessed a flesh katana, which was his original katana from when he was a demon slayer. His flesh blade allows him to execute attacks using his Blood Demon Art as he is able to channel electricity through his blood when unleashing an attack.
The Thunder Breathing Forms that Kaigaku could execute were the Second, Third, Fourth, Fifth and Sixth Form, with each form being as powerful as the next. In the end, during the Infinity Castle Arc, Zenitsu was able to overpower Kaigaku by executing apowerful Thunder Breathing formcreated to defeat Kaigaku, leaving him as the sole user of Thunder Breathing. Unlike other Upper Moons who had years of experience as a demon, Kaigaku was a demon for a short period of time, and he did not have enough time to fully master his unique Blood Demon Art. If Zenitsu had waited longer and until Kaigaku had become more powerful, there could have been a chance that Kaigaku could have defeated Zenitsu.
