Arcadios (アルカディオス Arukadiosu) is a Chief of the Cherry Blossom Holy Knight Squadron in the Royal Kingdom of Fiore, who when first introduced seemed to also have an allegiance towards Zeref.
Arcadios is a muscular, well-built man of average height, seen to be wearing armor of the Cherry Blossom Holy Knight Squadron. He has deep set eyes and high cheekbones, with a small scar running from his left temple to the edge of his thick eyebrows. He also has a snub, square-shaped nose. His hair is dark and wavy, sticking up around his head, with prominent sideburns that join into a curved and pointed beard.
As Arcadios watches the fight between Lucy Heartfilia and Flare Corona, he gets excited that "it" will be completed at theGrand Magic Games this year, and wishes for Zeref to wait just a little longer. After the first day of the Grand Magic Games, Arcadios is seen kneeling in the presence of Fiore's King, asking him if he has any requests for the battle pairings of the second day. After hearing the King's broken reply and request that he should rest, Arcadios leaves the room, laughing to himself at the thought of being able to relax when "that" is almost complete. During the second day of the Games, Arcadios accompanies the King to Domus Flau to view the battles portion of the competition. After the King conveys his excitement at getting to see Erza Scarletfight Bacchus, Arcadios quickly realizes that he has misinterpreted the King's request from the day before and organized for Elfman Strauss to fight Bacchus instead. When the King expresses his annoyance at the mix-up, Arcadios begrudgingly apologizes. During the battle, Arcadios has ordered some men to kidnap Lucy. However, the men fail and are captured by Natsu Dragneel, angering Arcadios and prompting him to proceed to plan B, a plan to utilize the discord between Fairy Tail and Raven Tail in order to capture Lucy and fulfill his Eclipse Plan. Arcadios is later approached by the Minister of Defense, Darton, who questions him about his intention when he tried to have Lucy kidnapped. Arcadios tells him that he needs Lucy to try a test run of the Eclipse plan, revealing to him that it is already complete. He also tells him that he is willing to sacrifice her life in order to open the gateway to changing the world, much to the Minister's horror.