Arthur Boyle

is a Third Generation Fire Officer at the 8th Special Fire Brigade of Tokyo.

Appearance
Arthur is a young man of average height, with shaggy blonde hair, which he tends to style upwards into a ponytail when in serious situations, such as a fight, so his vision would be clearer, and blue eyes. Arthur first appeared wearing a dark-colored jacket, with buttons and the insignia of a Special Fire Brigade, a white shirt, a belt and dark pants. He was later given a protective outer jacket and trousers. Arthur also carries a scabbard alongside him, in which he keeps his bladeless sword. Arthur refuses to wear a helmet when on missions, putting a hood on his head instead. He was also seen wearing a grey jumpsuit.

Personality
Arthur is confident in himself as a Third Generation, though he can be somewhat arrogant and full of himself, being disrespectful towards his senior Takehisa as soon as he met him. He has a knight-like complex, referring to the girls he meets as "princesses" and the 8th Special Fire Fighting Church as his "castle". Arthur was also said to be inexplicably popular, and is mentioned to always have a silent and mysterious facade. He also bickers often with Shinra on who are superior: knights or heroes. Arthur talks to people in a very casual manner, even if such people are of a much higher rank than him, which comes across as disrespectful at times. He is shown to be somewhat stubborn, and prefers to go his own way rather than what people think he should be doing. He takes great pride in his Excalibur.

Abilities
Arthur is a Third Generation, who has exceeded the abilities granted to him and is able to raise the temperature of the flames he creates, therefore allowing him to fabricate and control the fourth state of matter, plasma. Through this process, he uses the hilt of a sword to create an extremely hot, sharp and concentrated blade named Excalibur, which he uses as an equivalent to plasma cutting. The substance can resist being extinguished by the Second Generation, as shown when Maki wasn't able to extinguish the blade on her first attempt, unlike with Shinra and the flames on his feet.

Introduction arc
Standing outside a church, Arthur looks upon it and claims that it's going to be his castle. In the corridor, he bumps into Shinra and immediately picks a fight with the boy, which leads the two to the top of the roof, where they intervene between Iris and Maki. Arthur introduces himself to the girls and unsheathes his Excalibur, which leads Maki to question his choice of weapon. The ruckus caused by the two causes Takehisa to arrive, to whom Arthur disrespectfully introduces himself, commenting that all knights at the round table sit at an equal footing. Takehisa then informs Arthur about the upcoming tournament and orders Maki to fight the tho Third Generations, in order to test the abilities of the two. Arthur manages to use the generated plasma to his advantage, however, he is taken down by Maki's superior martial art skills. In a fit of rage, Arthur insults the girl, forcing her to create a gigantic fireball and end the fight in her victory. Arthur, left puzzled after his defeat, sits down against a wall to let the moment sink in.

Later, Akitaru treats Arthur and Shinra to some food at Ippudo Ramen and the three strengthen their relationship. Back at the church's armory, Arthur is offered a Seven-Style Fire Fighting Battleaxe to use by Takehisa, but he refuses to accept it and claims that Excalibur is the only weapon he requires. When the brigade is notified of a Flame Human spotted in Iriya District, they depart to the scene. While on route, Akitaru instructs Arthur and Shinra to conceal their weapons in public, much to his confusion. After arriving, Akitaru pulls the two boys aside for disobeying orders, where Arthur questions the instruction, leading Akitaru to justify his reasoning. Straight after, the conversation between the three is cut short, when a burst of flames emerges from the apartment. The team storms the building, where they find the Flame Human. Arthur volunteers himself to put the man out of his misery. With that, he ignites Excalibur and impales the being's core. Immediately after that, the ceiling begins to collapse, causing the brigade to escape.

Arthur participates in the Fire Officer Newcomer Tournament, but before it starts, he tells Maki that Mamoru looks like a geezer and nothing like a dog, after the girl gets fascinated by 119, but she corrects him, saying that the animal was modified to look that way. Later, Tamaki accidentally embraces him, which causes her to call Arthur a pervert. During the competition, he storms the building alongside the rest of the Fire Officers, where he notices Shinra's plan and calls it cheap.

Trivia

 * Arthur shares his name with Arthur Pendragon, who's weapon of choice was also called Excalibur.
 * Both King Arthur and Excalibur are inspired after a British medieval leader and his legendary sword.
 * Arthur was first seen on the cover page of Chapter 0, despite not debuting until Chapter 2.