Zenitsu Agatsuma

Zenitsu Agatsuma is one of the main protagonists of Demon Slayer: Kimetsu no Yaiba and along with Inosuke Hashibira, a traveling companion of Tanjiro Kamado and Nezuko Kamado. He is also a Demon Slayer in 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 a 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 teacher, Jigoro Kuwajima, and his inner focus and drives 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 whom 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 shows to become physically aggressive, lashing out at them in frustration.

Physical Abilities
Enhanced Strength: Zenitsu has attained amazing physical strength through years of harsh training. Zenitsu can hold down Inosuke Hashibira with his bare hands and swing his sword in rapid succession at speeds faster than the eye can see without fail.

Immense Speed & Reflexes: Zenitsu is one of the fastest beings in the series. His speed could easily evade the attacks and senses of several demons like the Tongue Demon and Spider Demon (Son).

Mental Abilities
Tactical Intellect: Zenitsu, being a talented fighter, has incredible wits and cleverness, being able to judge his opponents abilities and powers and developing countermeasures, even with one one form available to him. He can also use this ability while asleep, shown during the Tsuzumi Mansion Arc.

Miscellaneous Abilities
Enhanced Senses: Like all skilled Demon Slayers, Zenitsu possesses senses enhanced beyond a regular human level. This power is exemplified in his sleep, where he can discern his surroundings and detect the whereabouts of Demons in conjunction with his hearing.

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.

Indomitable Will: Like all Demon Slayers, Zenitsu possesses incredible willpower and spirit in order to kill Demons.

Fighting Style
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. This ability allows him to fight even after he falls victim to Enmu's sleep spells. As the story goes on, he continues to improve his skills and courage and depends on this ability less and less, allowing him to fight while conscious.

Swordsmanship
Thunder Breathing: A breathing style Zenitsu learned from a cultivator, Jigoro Kuwajima, and tried to master it, but could only be able to use the first form of the six forms in the breathing style. However, Zenitsu has become phenomenally proficient in fighting using the first form alone, even creating a variation. First Form: Thunderclap and Flash - The swordsman unsheathes their blade, dashes forward at blinding speeds, and decapitates the opponent in a split second, reminiscent of Iaijutsu.

Thunderclap and Flash: Sixfold - An extension of the Thunderclap and Flash technique created by Zenitsu. Zenitsu performs the Thunderclap and Flash technique six times in quick succession while slightly augmenting the power and speed of his dashes.

Equipment
Standard Nichirin Katana: Like all Demon Slayers, Zenitsu harbors a standard Nichirin Blade. His blade is yellow in color with the words Destroy Demons engraved on the side. His hilt circular shaped with 4 slight indentations, the center has a silver tone with small triangles and has a golden border. He also carries a white scabbard where he stores his katana.

Trivia

 * Zenitsu's surname means "my wife" (我妻 agatsuma?), while his given name means "goodness" (善逸 zen'itsu?). His first name contains the kanji for "good" (善 zen?) and "special, unique" (逸 itsu?)
 * 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 has also been mispronounced by Inosuke. Examples including Monitsu and Chuitsu in his dream as a squirrel squire.
 * Zenitsu is a member of the "Stylish Scruffy Democracy" band together with Tanjiro (Vocals), Inosuke (Taiko Drums), and Tengen (Harmonica). Zenitsu is the band's songwriter 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 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.
 * 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.
 * 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.

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 himself) "I hate myself more than anyone. I always think I have to get my act together, but I end up cowering, running away, sniveling. I want to change. I want to be a competent person."