Thunder Breathing

Thunder Breathing (の) is one of the five main Breathing Styles directly derived from Sun Breathing.

Description
Thunder Breathing is a Breathing Style that mimics lightning, specifically swift strikes and movements akin to lightning striking and the sound of thunder itself, and replicates it with the user's movements, techniques and abilities. Most, if not all, known techniques and forms involve utilizing blinding speeds to close in and swift and insanely fast movements to overwhelm the opponent instantly. The movements of Thunder Breathing are so immense that it creates a sound akin to thunder. Users that have mastered Thunder Breathing visualize themselves seemingly creating and manipulating lightning when unleashing its techniques.

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. This combat style is very reminiscent of the real life sword style known as Iaijutsu.

It was created from one of Yoriichi Tsugikuni's students who attempted to learn the Sun Breathing, but due to not being as innately powerful as Yoriichi, they were instead taught an alternated breathing style that focused on their individual strengths and weaknesses, which eventually evolved into the Thunder Breathing.

A known cultivator of Thunder Breathing in the Demon Slayer Corps is Jigoro Kuwajima.

Known Techniques
Thunder Breathing has 6 standard forms, with the First Form said to be the foundation for the rest of them. 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 6 of the Twelve Kizuki.

Note: Since the second to sixth form has only been displayed by Kaigaku who uses lightning in conjunction with his sword attacks, it is unknown how a normal Thunder Breathing swordsman would perform these techniques.

Trivia

 * The First Form: Thunderclap and Flash is stated to be the basis for the other forms, which was all Zenitsu could learn and hone, while Kaigaku couldn't despite learning the other forms after it. Two unnamed Demon Slayers said that he wouldn't be able to master the others much.