After the deaths of Daki and Gyutaro, Kaigaku was promoted to become Upper Moon Six of the Twelve Demon Moons due to his power and confronted Zenitsu as a rematch he always desired.
One of the characters that people mistake for Zenitsu's brother in the series is Kaigaku. However, this is not true, and Kaigaku is just his senior in the dojo where the two trained under the guidance of Jigoro, and was also adopted by the former Thunder Hashira.
What rank was Zenitsu brother? He was a member of the Twelve Kizuki, holding the position of Upper Rank Six after the deaths of Daki and Gyutaro. He serves as a supporting antagonist in the Infinity Castle Arc.
During the Hashira Training Arc, Zenitsu receives word that Kaigaku had become a demon, and that Jigoro committed seppuku as atonement.
Why did Zenitsu brother turn into a demon? In order to save himself, he begged the demon to spare his life, and became a demon after Muzan's blood was given to him. He became the new Upper Moon 6 demon and, because of this, Jigoro killed himself by committing Seppuku.
Zenitsu Agatsuma only uses one move (in anime up till now) , I.E. Thunderclap and Flash, because he hasn't learned the other Thunder Breathing Forms. He never wanted to learn any breathing techniques or fighting techniques nor he wanted to join the Demon Slayer Corps.
Why Zenitsu could not become a Hashira in Demon Slayer. Fans have wondered whether Zenitsu ever got to realize his dream of becoming a Hashira at all. Unfortunately, the answer to this question would be, no, he did not. Zenitsu, along with Tanjiro and Inosuke got way stronger than average corps members with training.
When facing Kaigaku during the Infinity Castle arc, Zenitsu debuts his brand new exclusive Seventh Form to Thunder Breathing. With this, Zenitsu finally has more than one tool in his arsenal and has overcome his own personal doubts and fears.
History. Jigoro was the instructor of Zenitsu and Kaigaku as the former Thunder Hashira.
Upper-Rank Five: Gyokko
As a fellow artist, Gyokko became distracted by Haganezuka's dedication to sword-polishing and opted to hold off on finishing off a wounded Muichiro. Tokito then manifested his Mark and effortlessly decapitated Gyokko with Mist-Breathing, Seventh Form: Obscuring Clouds.
Nezuko's rankings in the popularity polls are as follows: Nezuko ranked 3rd place in the first popularity poll with 3,319 votes. Nezuko ranked 11th place in the second popularity poll with 5,000 votes.
Over a century ago, Doma held the position of Upper Rank Six ( 上 じょう 弦 げん の 陸 ろく , Jōgen no Roku?), and during that tenure, he turned Gyutaro and Daki into demons and introduced them into the Twelve Kizuki.
When looking at the symbolism in Japanese culture, sparrows represent 'the soft demeanor of deep thinkers' and are often considered to bring good fortune- and Zenitsu's name literally includes the kanji for good!
Zenitsu also protects Nezuko multiple times when she is in danger, evident during Zenitsu's first meeting with Inosuke Hashibira and the battle against Enmu in the train. Eventually Zenitsu and Nezuko would marry and start a family as evidenced by their descendants.
Ami Agatsuma is the Sister of Zenitsu Agatsuma that we all know from his cowardly nature.
While unconscious, Zenitsu is a force to be reckoned with, but his actual power is discovered when he is awake. While awake, Zenitsu was able to match the upper rank six, Kaigaku. He was also able to keep up with the Demon King, though he was in a weakened state during this battle.
There are six forms, but Zenitsu could only learn the first form said to be the basis for the others yet he honed it to where he could fight against several strong demons. He later created a seventh form and defeated his former senior who had become the Upper Rank Six of the Twelve Kizuki.
Exploring Zenitsu's fighting abilities in Demon Slayer
Zenitsu has perfected the first form only and is seen performing it only when he's unconscious. But the manga shows that he can fight without fainting or going unconscious.
Despite her petite appearance, Mitsuri Kanroji has a special muscular composition that makes her muscles eight times denser than an ordinary human's. She is also more flexible than the other Hashira. These two strengths balance out her being the slowest runner out of all the Hashira.
The spider demon explains that the spider that bit Zenitsu earlier was one of his, and Zenitsu has been poisoned and will slowly start turning into a spider. As always, Zenitsu goes into a state of frenzy, and then he climbs a nearby tree.
Zenitsu is a powerful Demon Slayer and a member of the Demon Slayer Corps.
Akaza appears before Muzan and reports to him that he could not find the Blue Spider Lily, instead, he took down one of the Hashira. Muzan retorts it was only one Hashira and declaring his desire is for all to be dead. Angered at his failure, Muzan takes control of Akaza's cells and causes him to bleed heavily.
Akaza's appearance as a human at the age of 18.
Because of his desire to become stronger and Doma's strength allowing him to surpass himself to become Upper Two, Akaza harboured an intense hatred of Doma. Doma, as apathetic as he is, considered him his "best friend", seemingly ignoring the contempt Akaza possessed.