abstract
| - 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 Grand Line, 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 Busoshoku Haki 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 sufficient training Buster was able to use his own physical abilities 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 regarding the manner in which he crated the flames. Where Buster used his tremendous speed 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, Sid made use of his Devil Fruit, the Hazu Hazu no Mi's powers to create the flames. He would suddenly increase the momentum of the air around him to such a great degree that it would move away from him at speeds high enough to create sufficient friction with the surrounding air to create the flames. Over the time-skip he has developed another 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.
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