Arthur Boyle (アーサー・ボイル, Āsā Boiru) is a Third Generation Fire Officer of Tokyo's 8th Special Fire Brigade.
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Name: Arthur Boyle
Origin: Enen no Shouboutai
Classification: Human, Firefighter, 3rd Generation
Attack Potency: Wall level (Is able to easily cut walls of steel with his plasma-sword)
Speed: Subsonic (Blitzed a powered up sentient flame human)
Lifting Strength: Peak Human
Striking Strength: Unknown, most likely Human Class, Wall Class via fire (Was able to kick a several tons heavy car tens of meters into the air with little effort)
Durability: Wall level to Small Building level (Tanked attacks that easily cracked concrete floors several times without any sign of injuries)
Stamina: Very high (Fought on several occasions against high level enemies and kept fighting even after being beaten down several times)
Range: As far as his feet can reach, extended to a few meters if fire is used (depends on ways of usage)
Standard Equipment: Usual in-story firefighter equipment, high-tech sword handle that allows him to compress his flames and create a plasma sword
Intelligence: Not very book smart but showed remarkable instincts while fighting powerful enemies
Weaknesses: Can only be a expert with his sword if he uses it with his right hand. Can only create plasma because of the special technology in his sword handle.
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. Using this plasma sword, Arthur is able to cut through objects with great ease, as it has the same effects as plasma cutting.
Arthur uses Excalibur exclusively in his right hand, otherwise he's known to lose all ability using the sword effectively. Excalibur has shown the proficiency the ability to deflect and fend off against flames. With his Excalibur, Arthur is capable of easily cutting through metal, and generating electricity.
He also possesses incredible raw physical strength, being capable of sending an opponent bigger than him in size flying with a single punch.