Zenitsu Agatsuma is a part of the
That's the thing about Zenitsu. He doesn't realize how strong he is because his anxiety holds him back. While unconscious, he can have a clear head and fight back, giving Zenitsu an edge over his fellow slayers.
Zenitsu is one of the main characters, and he does stop being a coward in Chapter 143–146, which is hte final arc of the series.
Though he is skilled, he is constantly scared of things that pose a danger to his life. However, as the series progress, he has also shown incredible brilliance and bravery.
This mastery allowed Zenitsu to form a Seventh Form of Thunder Breathing that is unique only to him: Honoikazuchi no Kami. While this move might seem similar to Thunder Breathing's First Form, the speed and power of this technique are on a whole new level.
Tanjiro Is Strong, and Stronger than Zenitsu as he uses Sun Breathing.
Hinokami Kagura, also known as Sun Breathing, is easily one of the strongest Breathing Styles in the series by a wide margin. It's the Breathing Style that served as the base for every other style in the series, which is no mean feat.
At this point Zenitsu has manifested his speed and power, and he was also able to keep up with the Demon King, Muzan, even when weakened. It's possible to say that his power easily matched the strength of a Hashira.
Thunder Clap and Flash—Godspeed is the most powerful of Zenitsu's derivations of the Thunder Breathing first-form technique.
Zenitsu is an incredibly powerful Demon Slayer, but he's always in fear. His nerves calm down when he's asleep, so that's when he awakens his “powers”. MANGA SPOILER AHEAD!!!
Zenitsu — Anxiety
To the surprise of absolutely nobody, Zenitsu is anxiety incarnate. He starts out the series so paralyzed by fear that he can't even fight when he's conscious, and so he's only able to fight when he's passed out.
He was forced(not in a bad way) to train because his Master Jigoro Kuwajima saw potential in him, but despite of rigorous training He could not learn more than one form. He has only learned the first Form and has mastered it. Mastered it in a sense that he can use technique multiple times (six fold).
Zenitsu is an incredibly powerful Demon Slayer, but he's always in fear. His nerves calm down when he's asleep, so that's when he awakens his “powers”. MANGA SPOILER AHEAD!!! Zenitsu becomes a lot more courageous and stands up to a powerful demon while wide awake.
2) Tanjiro Kamado
With Sun Breathing, which is regarded as the paramount of all Breathing Styles, Zenitsu will have a hard time subduing Tanjiro and will be defeated by the latter in no time.
The reason for this is pretty simple. Zenitsu wasn't able to master the other 5 forms. He never wanted to learn any breathing techniques. or fighting techniques, nor he wanted to join the Demon Slayer Corps.
Thunder Breathing has 6 standard forms in total, with the first form said to be the foundation for all the other forms. However, Zenitsu Agatsuma developed a Seventh Form in order to stand on equal ground with Kaigaku, his former senior disciple under Jigoro who had become the Upper Rank Six of the Twelve Kizuki.
But, comparing the two characters in their best forms, Zenitsu might be just a tad bit faster owing to his Godspeed move.
Inosuke is probably the closest to Zenitsu in terms of power, considering they're both new Demon Slayer recruits and they're both less skilled than Tanjiro. If they ever were to face off, however, it's likely Inosuke would win.
1) Tanjiro Kamado
Although he and Zenitsu along with Inosuke, started training together, he excelled both in the matters of strength and swordsmanship. Tanjiro with his Sun Breathing is more powerful than Zenitsu.
Gyomei Himejima, the Stone Hashira, is the strongest Hashira in the Demon Slayer corps in terms of strength and swordsmanship. He is the only person who uses spiked flails and an axe instead of standard swords to kill demons. Such a weapon takes immense precision and soundness to use without inflicting personal damage.
To sum it up, it is possible for Zenitsu to fight without fainting and it has been shown clearly in the manga. While he only perfected the first form, he trained hard enough to create a new form that didn't exist before.
Yoriichi Tsugikini. Yoriichi Tsugikuni is the strongest demon slayer character to have ever existed in the series. He is also the only person that Muzan was ever afraid of. He invented the original breathing styles that later branched out into the ones that Harshiras use to date.
Can Demon Slayers Use Multiple Breathing Styles? The only known Demon Slayer who is capable enough to have two Breathing Styles at his disposal is Tanjiro Kamado. He initially started without any knowledge of Breathing Style and had no prior training in swordsmanship.
Sun Breathing is the foundation of the Breathing Techniques in Demon Slayer and the five main Techniques: Wind, Water, Flame, Stone, and Thunder are Branched out of it. The Sun Breathing, the prime swordsmanship technique, is more powerful and dominant.
Most people consider Sakonji Urokodaki to be the master of the Water Breathing technique, having taught many notable students including Tanjiro and the current Water Hashira, Giyu Tomioka.