Zenitsu is cowardly, weak-willed, and anxious, often claiming that he doesn't have long to live due to the dangerous job of being a Demon Slayer. He has rather low self-esteem despite his talent and strength, even considering himself useless, evident 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 skill. Zenitsu is in a constant state of fear and he frequently 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. Due to this, Zenitsu screams and shouts a lot, much to the annoyance of the people around him. He is also shown to be pessimistic at times, especially during Hashira Training where he lashed out at Tanjiro and Inosuke for viewing the training positively.

In spite of his weaknesses, Zenitsu desires to live up to the expectations others have set 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 also hates himself for how cowardly and incompetent he is, genuinely striving to better himself.

Overall Abilities

From the beginning, Zenitsu comes off as a talented and skilled Demon Slayer though he denies this. His strength awakens when he is asleep as his nervous demeanour is what normally keeps him from accessing his abilities, making him more sagacious, calm and precise in combat. This allowed him to instantly decapitate the Tongue Demon and defeat Son of the Spider Family by himself. He was later able to defend 3 entire train carts being under attack by Enmu, Lower Rank One, along with Nezuko. A few months after that, he was able to go toe-to-toe with an awakened Daki with the assistance of Inosuke, and later managed to blitz her with Thunderclap and Flash: Godspeed. As further credence to his strength, Zenitsu was able to advance to the highest point of the Hashira Training. However, the greatest extent of his powers manifests when Zenitsu fights while awake, as he managed to outmatch the new Upper Rank Six, Kaigaku, in speed by himself and was later blitzed and decapitated him before he could react, although he sustained several severe injuries. Moreover, Zenitsu's initial reluctance to kill Kaigaku, someone he once cared about and looked up to, was the only thing that gave the Upper Rank the initial advantage, hinting that he could have simply killed him from the beginning if he so desired. Later on, he could keep up with and battle the Demon King, Muzan Kibutsuji, …

Master Swordsman: Zenitsu is an incredibly talented swordsman, displaying highly refined proficiency in extremely fast Iaijutsu-like swordsmanship and the Thunderclap and Flash technique, to the point he can create offshoots of the technique and utilize it even while he is asleep. His swordsmanship skill allowed him to fend off dozens of spiders an...