The newly appointed Paladin, exorcist Higher First Class with headquarters in the Vatican. He was sent by the court Gregorian to Japan to hear the death of Mephisto Fujimoto and links to the Japanese subsidiary of Satan. On this occasion, managed to intercept Rin and bring him to court Gregorian. Arthur is a respected exorcist despite questionable ethics. Shura was said to him, saying that the show is a saint, but it really is a demon in my heart. He uses a special sword (due to the fact that he feels), Caliburn, who when she speaks she sounds like she is in love with Arthur. Its name refers to King Arthur's sword, Excalibur.