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.
Zenitsu recalls that moment and laments that everything he has experienced had led up to his transformation into a spider.
This piece of fan art is a complete fiction as Zenitsu has never become a demon as depicted in the original artwork, but what it does is imagine a world in which that would happen in this way and shows fans the product of such an event.
Zenitsu Agatsuma is a part of the Demon Slayer Corps who the previous Thunder Hashira trained. Zenitsu is a skilled and able member of the organization but gets easily scared when facing demons. But as the series continues, we watch him grow as he eventually overcomes his fear of demons and fights them head-on.
Episode 17 | Kimetsu no Yaiba Wiki | Fandom.
Though he eventually avenges his family during the final battle, he loses his left arm and right eye in the process while being fatally wounded. Both are restored during Muzan's attempt to turn him into his successor by transforming him into a demon, though with the aid of his friends, he becomes human once again.
After his treachery, Kaigaku later becomes Zenitsu's archenemy. His cowardice would later lead him to his downfall when Zenitsu overcomes his insecurities as Kaigaku mocks Jigoro. Kaigaku's Thunder Breathing training would lead to his Blood Demon Arts being related to lightning.
Demon Slayers are known for their strength and bravery in battle, but not Zenitsu. Despite his cowardice, he's one of the strongest in the series.
Zenitsu doesn't realize his own strength
In fact, he's upset — he was hoping he would die and get out of having to fight demons. He's not at all confident in himself, often repeating that he "knows he'll die soon" and "it's only a matter of time." Fortunately for him, he does have amazing powers.
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.
His second form is no exception, with Rice Spirit being a succession of five slashes that are accompanied by his black lightning. It's fatal to most opponents, although Zenitsu had the constitution and awareness required to avoid any major damage from this attack.
Unfortunately, Gyutaro spots Inosuke and stabs him right through where his heart should be with a sickle imbued with deadly poison.
Zenitsu mastered the first form to its full capacity but failed to learn the rest. However, the first form itself is extremely difficult. With his master gone, Zenitsu can no longer learn the remaining five forms. Therefore, during his fight with Kaigaku, an Upper Moon Six, he created a 7th form.
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. In fact, he became one of the very few to even invent a new form of Thunder Breathing. However, his dream of becoming a Hashira was never realized.
Abilities And Techniques
In the beginning of the series, Zenitsu is seen as a weak person who doesn't seem capable of much until he is asleep. In his sleeping state he awakens an extraordinary power that makes him an extremely powerful and skilled swordsman.
Chuntarothe the sparrow is an eloquent fit for Zenitsu for several reasons. 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!
Thunder Clap and Flash—Godspeed is the most powerful of Zenitsu's derivations of the Thunder Breathing first-form technique.
Tanjiro Is Strong, and Stronger than Zenitsu as he uses Sun Breathing.
Nezuko Kamado
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.
Zenitsu is clearly on the same level as Hashira. If we compare him to Shinobu, his speed is far better, while she lacks quite a lot in raw power. There is a good chance that he could beat Shinobu if the two decide to fight.
Zenitsu then is slashed by Kaigaku with the Thunder Breathing, Second Form: Rice Spirit.
Among the current generation members, Shinobu and Zenitsu are the fastest characters in the series. According to the Upper Moon 2, Shinobu was the fastest opponent he had faced and was unable to react to her attacks due to its speed.
When Zenitsu sees her for the first time and discovers that she is a cute girl, he quickly gets mad at Tanjiro because he thinks that Nezuko is actually his girlfriend instead of his sister.
According to Zenitsu, Jigoro never gave up on him to make him stronger and a better swordsman. He took care of Zenitsu like he was his grandson, he saved Zenitsu many times and he has shown unlimited patience at training the boy despite his cowardless and laziness.
He abused Zenitsu Agatsuma. He betrayed the Demon Slayer Corps, driving his master to suicide.