Flame Breathing

Flame Breathing is one of the five main Breathing Styles directly derived from Sun Breathing.

The Flame Breathing combat and breathing style mimics flames, specifically their powerful heat and scorch, and replicates it with the user's movements, techniques, and abilities. Most, if not all, known techniques and forms involve extremely powerful singular strikes and movements that are so intense, it 'burns' the opponents. When utilized properly, the user visualizes themselves manipulating and generating fire in a deep shade of orange and red, causing flames to seemingly emanate from their weapon, surroundings, or themselves.

Users

 * 1) Kyojuro Rengoku
 * 2) Shinjuro Rengoku

Forms
"First Form: Unknowing Fire - The swordsman charges towards their opponent at high speed and decapitates them in one slash so powerful that it generates enough friction and heat it burns the flesh of their enemy. This technique had enough force to launch the entire Infinity Train off the tracks a short distance.""Second Form: Rising Scorching Sun - The swordsman releases an arching slash attack upwards.""Third Form: Blazing Universe - The swordsman swings their blade downwards in an arc.""Fourth Form: Blooming Flame Undulation - The swordsman swings their blade in a circular motion that can defend them from all incoming attacks or decapitate multiple enemies at once.""Fifth Form: Flame Tiger - The swordsman unleashes a powerful series of sword slashes that takes the form of a rampaging tiger engulfed in flames that charge towards the enemy at blinding speeds.""Ninth Form: Rengoku - The most powerful Flame Breathing technique. A devastating dashing slash that the swordsman initiates from a high stance, the technique had enough power to carve a deep impression that burnt the ground where it was unleashed. In the movie adaptation, this attack takes the form of a titanic flaming dragon with blue eyes that emits blue streaks of electricity from its mouth. After this technique is performed by Kyojuro in the movie, the surroundings were seemingly engulfed in flames, creating a purgatory-like hellscape and a giant whirlwind of heat and fire in the wake of the attack."

Trivia

 * This breathing style is used by the former Flame Hashira, Kyojuro Rengoku.
 * Also, this breathing style is used by the second former Flame Hashira, Kyojuro Rengoku's father, Shinjuro Rengoku.

Reference

 * 1) https://kimetsu-no-yaiba.fandom.com/wiki/Flame_Breathing