Kyokuba Kenpo

Kyokuba Kenpo (曲馬拳法, lit. Circus Style) is a form of martial arts used by Eustass D. Sid. Originally developed by Buster Keaton, the eccentric owner of the Keaton's Travelling Circus, it was passed on by him to Sid when he temporarily joined the circus crew immediately after leaving the Marines. Developed by Buster by adding the principles of Fire eating to his knowledge of martial arts, this art makes use of fire for both melee and ranged combat. The users of this style can not only generate flames from any part of their body, they can also coat their body in said flames to use not only as a form of defense but to attack with the flames as well. As such practitioners of this art seem to have developed a resistance to high temperatures and are seemingly immune to getting burned.

Buster, a former pirate who at one time had ventured into the, had developed the art of fire eating to such a level that he was able to will the flames to not hurt him, which Sid assumed meant that he used to protect himself from the flames. But that was but a part of the trick, Buster had spent so much time playing with fire that his body had over time become accustomed to high temperatures and having gotten burned on innumerable occasions, he had lost all fear of the flame, thereby gaining a psychological advantage that helped to greatly increase his threshold for enduring burns. Also, instead of using external sources to create the fire, as he originally used to do, after consuming his Devil Fruit, Buster was able to use its powers to create the flames.

Sid had to spend months before he reached a level of comfort around fire that allowed him to be able to learn Kyokuba Kenpo, having bypassed the years of training and practice it had taken Buster by focusing on just what was required instead of learning fire eating as a whole. Already having a fairly good grasp on Busoshoku Haki also helped speed up his learning curve. But he had to change the style a little due to him not having the powers of a Devil Fruit like Buster's to create the flames. Instead he made use of his skills with Soru to create enough friction with the air to create the flames, vibrating parts of his body at very high speeds to set them on fire. Over time he has developed a new means to create the fire, by projecting Busoshoku Haki outwards from his body in rapid bursts, he is able to create enough friction between the particles of the air itself that it bursts into flames.

Techniques

 * Moeru Yoroi (燃える鎧): A defensive technique, used by Sid wherein he surrounds himself in flames and uses the high temperature of the flames to ward off physical attacks. While early on he could only make the shroud strong enough to repel punches and kicks, he has since then managed to achieve a level of control that allows him to make such intense flames that they can even burn off bullets and arrows.


 * Hiken (火拳): A technique named after 's signature attack, an attack that Sid actually saw in action, Sid developed a similar attack using his Kyokuba Kenpo. By creating fire around both his fists and shrouding them in it, Sid can then launch a very powerful attack in the form of a simple fiery hot punch. By simply surrounding his fists in fire and landing punches that have the weight and raw power of his physical body behind them and the burning power of the flames to burn then as well, he is able to inflict a great deal of damage on his opponent.


 * Kakyū (火球): Sid creates a large quantity of flames above his hands and uses Busoshoku Haki to mold its shape to create a giant ball of flames. He then tosses the ball at his target. The flames are very intense in nature and the resulting explosion when the fire ball hits a target is strong enough to level buildings and leave a giant crater in the ground.


 * Kasen (火箭): An offensive variation of Moeru Yoroi, Sid physically launches himself at his opponent, barreling into them at high speeds. Not only does this harm the target with the blunt physical force of the impact, the flames further add to the injury by burning them as well.


 * Unnamed Mist based technique:


 * Titan (タイタン):


 * Fire Storm (ファイアストーム): Sid creates such a large quantity of fire that it affects the wind system around it and feeds itself to give rise to a firestorm. The firestorm can cover great distances, being great enough to destroy entire sections of forests if not stopped in time.