Zenitsu Agatsuma

Zenitsu Agatsuma is one of the main protagonists of Demon Slayer: Kimetsu no Yaiba and a traveling companion of Tanjiro Kamado. He is a Demon Slayer and member of the Demon Slayer Corps.

Appearance
Zenitsu is a young man with fair skin and downward-sloped, scared-looking eyes that fade from soft brown to gold. He has short, yellow hair of varying lengths, cutting off squarely at the ends where it fades to a darker orange color, that falls in front of his face in uneven bangs. Before he became a Demon Slayer, Zenitsu's hair was originally black, but it turned the color it is currently when he was struck by lightning during his training.

For some time following the battle at Natagumo Mountain, his limbs temporarily shrunk due to Demonic poison but were able to return to normal afterward thanks to the medicine given to him by Shinobu Kocho.

He wears a paler brown version of the standard Demon Slayer uniform, which consists of a dark brown gakuran jacket, a white belt around his waist and hakama pants that extend, as well as his signature white-triangle patterned, yellow and orange gradient haori. As well as this, Zenitsu also sports a pair of tabi socks, tied at the front in 3 white bows, with the same pattern as his haori, and white-laced footwear.

Personality
Zenitsu comes off as a coward, as he often claims that he doesn't have long to live due to the dangerous job of being a Demon Slayer. He also has rather low self-esteem despite his strength, even considering himself useless as seen when he couldn't believe he had slain a Demon and tricked himself into instead believing that it was Shoichi, even though the latter was a young child who didn't possess any form of special Demon-slaying ability. Zenitsu is in a constant state of fear and always cries and tries to run away at the sight of danger, claiming he wants to live a modest, normal life, instead of that of a Demon Slayer.

However, despite these weaknesses, Zenitsu still wants to live up to the expectations others set up for him and will try his hardest when he needs to. He holds great respect and admiration towards his comrades and his deceased teacher, Jigoro Kuwajima, and his inner focus and drive in avenging him help to wash away his cowardice and second thoughts when he is in a pinch.

Zenitsu is also shown to be something of a wannabe womanizer, stemming from a desire to not be single should he be killed. He tends to hit on girls who he thinks are cute and asks them to marry him, much to their annoyance. This womanizing nature is shown to override his docile personality, in particular when he believes his comrades are "flirting" with cute girls, he soon snaps and goes in long hysterical rants and complaints. During these times, he is also shown to become physically aggressive, lashing out at them in frustration.

Before the raid on the Infinity Castle, Zenitsu gives off a different, more serious vibe as if he is focused on something important. This development occurred after receiving a letter from Chuntaro, which revealed his master's death and Kaigaku's role behind it. During his fight against Kaigaku, Zenitsu is stern and becomes enraged, causing him to angrily yell at him for disrespecting their cultivator. His sudden change surprises his ex-senior, as Zenitsu shows a more mature persona compared to his usual cowardice.

Natural Abilities

 * Enhanced Hearing: Zenitsu has a heightened sense of hearing, allowing him to detect danger from even the faintest of sounds. He can also hear people's thoughts and emotions if he uses his sense of hearing to its fullest potential. He can also use this ability to locate Demons by comparing the sounds produced by a Demons' body to those produced by a human.


 * Enhanced Physical Prowess: As a Demon Slayer that could single-handedly defeat an upper moon, Zenitsu's physical capabilities are easily superhuman. This is also displayed in his battle with Muzan when he was able to fight him while being extremely injured.
 * Enhanced Reflexes: Zenitsu's reflexes are always superb, but his cowardly nature usually prevents him from using them to their full potential.
 * Immense Speed: Zenitsu's most notable physical trait is his supernatural speed. His speed can evade Daki's extrasensory perception and was so fast it was unperceivable by Kaigaku, a user of the same Breathing Style.


 * Keen Intellect: During his battle against Daki, he was able to determine the correct method to fight her and knew how he had to combine his attacks with Tanjiro so that Inosuke could cut off her head.


 * Unconscious Combat: Zenitsu becomes stronger when he sleeps. When his life is in danger, the fear he experiences exceeds his limits and makes him fall unconscious, which is when he reaches his true potential; when Zenitsu is asleep, he can perform his swordsmanship at a high level based purely on instinct alone. However, as the story goes on, he continues to improve his skills and courage and depends on this ability less and less, beginning to showcase the same skill and ability when conscious.

Swordsmanship
Thunder Breathing (の): One of the five main Breathing Styles directly derived from the Sun Breathing. The Thunder Breathing combat style mimics swift strikes and movements of lightning and electricity and infuses it with the users swordsmanship. This combat style is very reminiscent of the real life sword style know as Iaijutsu.

It has been remarked by Zenitsu that this combat style focuses on channeling strength into the user's legs, and maximizing the output of every single muscle and blood vessel in them. 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 6 of the Twelve Kizuki.


 * 1) First Form: Thunderclap and Flash (ノ) - Zenitsu unsheathes his blade, dashes forward and aims to decapitate his opponent. This technique is most reminiscent to Iaijutsu. Zenitsu has honed this ability to the extent of being able to repeat the dash multiple times in quick succession.
 * 2) * Six Fold - A compilation of the First Form with a series of six dashes.
 * 3) * Eight Fold - Zenitsu dashes eight times within one use of this technique.
 * 4) * God Speed - Further augments the speed of Thunderclap and Flash. He is only able to use this ability twice a day. After the second time, his legs become useless. During the final battle against Muzan, Zenitsu is able to use God Speed more than two times.


 * Seventh Form: Honoikazuchi no kami (ノ) - This form is created by Zenitsu himself and is possibly Thunder Breathing's most powerful technique. Zenitsu's blade takes the form of a bright yellow dragon that seemingly emanates sparks of electricity and dashes forward at blinding speeds surpassing his God Speed technique and decapitates his opponent.

Trivia

 * Zenitsu's surname means "my wife" (我妻), while his given name means "goodness" (善逸). His first name contains the kanji for "good" (善) and "special, unique" (逸)
 * Zenitsu's rankings in the popularity polls are as follows:
 * Zenitsu ranked 2nd place in the first popularity poll with 4,299 votes.
 * Zenitsu ranked 1st place in the second popularity poll with 17,451 votes.
 * Zenitsu also appeared in The Promised Neverland ' s 2020 popularity poll, ranking 29th place with 44 votes.
 * Thanks to his hearing, Zenitsu is very skilled at playing the shamisen and the koto.
 * Zenitsu is a member of "Stylish Scruffy Democracy" band together with Tanjiro (Vocals), Inosuke (Taiko Drums), and Tengen (Harmonica). Zenitsu is the band's song writer and the Shamisen player. "Exploding skin and the melancholy of modern smell" is their debut song that made everyone who heard it feel dizzy and vomit non-stop. Zenitsu also wrote a song entitled "Previous Life's Sins".
 * Zenitsu is the only non-Hashira Demon Slayer to have done feats specifically only Hashira have done:
 * Create a new, original form in a Breathing Style with multiple users (done by Giyu Tomioka).
 * Defeat an Upper Rank by himself (done by Muichiro Tokito).
 * Zenitsu has an overbite.
 * The pattern on Zenitsu's Haori may be inspired by Uroko, a traditional Japanese pattern that symbolizes scales. Samurai would wear clothing with this pattern to protect themselves from harm.
 * After the events of the story, Zenitsu wrote a memoir entitled "The Legend of Zenitsu".
 * Zenitsu is superstitious as he was shown to be delighted seeing two tea stalks in his tea in the extra chapters. In Japan, seeing Chabashira or a tea stalk floating vertically in your teacup when you have Japanese green tea is a sign of good luck.

Quotes

 * (To Tanjiro Kamado) "So you were carrying such a cute girl with you... You were carrying such a cute girl with you every single day... and going about your journey with such joy... Give me back the blood I bled for you!!!"
 * (To Jigoro Kuwajima) "But I love you, Gramps!"
 * (To Nezuko Kamado) "I will protect you, Nezuko."
 * (To Kaigaku) "Grandfather wasn't senile. If I'm scum, then you're trash. I feel sorry for grandpa for having such pathetic successors. I can only do the First Form and you can do everything except that!"
 * (To Kaigaku) "This is my form. I created it, so it's all mine. With this technique... I wanted to fight you as an equal!"
 * (To Tanjiro Kamado) "Tanjiro! Focus on staying alive! Can you hear me? Don't die! You can't die! Nezuko's gonna to be human again! And you're gonna get her out of here! And go back to the house where you grew up! Your family is waiting for you two to return!"

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