Thunder Breathing is one such technique that Zenitsu has used to great effect in the series. Of course, Zenitsu is only the master of the first form, but it goes without saying that the other techniques of Thunder Breathing will also be awe-inspiring to witness in Demon Slayer.
This breathing style originally had six forms, each being extremely difficult. 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.
Zenitsu told Tanjiro how basic lightning breathing works and Tanjiro used it to put all of his energy into his legs for a speed boost but not the actual lighting breathing.
While unconscious, Zenitsu is a force to be reckoned with, but his actual power is discovered when he is awake. While awake, Zenitsu was able to match the upper rank six, Kaigaku. He was also able to keep up with the Demon King, though he was in a weakened state during this battle.
As we've seen multiple times, Zenitsu is only able to use Thunder Clap in flash. even though Thunder Breathing has 6 forms. The reason for this is pretty simple. Zenitsu wasn't able to master the other 5 forms.
Thunder Clap and Flash—Godspeed is the most powerful of Zenitsu's derivations of the Thunder Breathing first-form technique.
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.
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.
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.
But, comparing the two characters in their best forms, Zenitsu might be just a tad bit faster owing to his Godspeed move.
Thirteenth Form of Sun Breathing in Demon Slayer
It involves a combination of all existing Sun breathing techniques — but performed in a consecutive manner. This technique's primary purpose is to slash all the twelve vital organs of a demon. Each form targets a specific organ. Tanjiro only used it once in the manga.
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.
The eccentric and flamboyant Tengen Uzui is the current Sound Hashira. This Breathing Technique gives him echolocation and other advanced hearing abilities.
Breath of the Sun
It's the oldest and most powerful breathing style that was used to develop the Flame, Water, Moon, Thunder, Stone, and Wind Breathing techniques that demon slayers use to this day. It mimics the intensity and versatility of the sun, lessening a demon's ability to regenerate.
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.
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.
172.1 Km/h Whenever he performs his thunderclap And flash move.
1. Gyomei Himejima. 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.
Tanjiro Is Strong, and Stronger than Zenitsu as he uses Sun Breathing.
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.
Sun Breathing has the second highest number of known techniques of all the breathing styles. It has twelve forms that can all be combined into an extremely powerful thirteenth form. It is second only to Moon Breathing which has sixteen techniques, employed by the Upper Rank One demon Kokushibo.
Zenitsu's Thunderclap and Flash has always been the fastest attack in the Demon Slayer franchise.
Beast Breathing, related to Wind Breathing, is a style developed by Inosuke. This style of breathing focuses on the unpredictability of animals, making the forms and overall fighting unpredictable and in the moment. Something that is crucial to Beast Breathing is utilizing the sense of touch.