“Well, my mother fought with the liberation army. After the war we all fled to Silesse. But my mother and baby sister were taken from me, and this pendant is all I have left of her. I found out just recently that it was King Bloom who took them from me. I also found out that my mother had passed away but that my sister was still alive! YOU are my sister! I've come all the way from Silesse for you!”
—Part of Arthur's conversation that recruits Teeny
Separated from his mother and sister from a young age, Arthur perpetually grew up in Silesse alone, mastering the art of Wind Magic. He later travels with Fee to search for Teeny in the events of Chapter 6. He initially holds a grudge towards Bloom for wrenching his family away from him, but later develops a deep hatred for Hilda as well, as he learns that she is directly responsible for inflicting the most amount of pain and suffering to his family.
Arthur appears to be cold and unfeeling on the outside, but is, in actuality, a kind and sensitive individual on the inside. Arthur is also cool-headed, logical and sharp in his responses to quips made towards him.
Arthur's vulnerable side is revealed upon his learning of his mother Tailto's tragic fate and the suffering his surviving sister Teeny endured. This results in him being protective over Teeny, as he resolves to never be separated from her ever again.
Arthur can be very good, and usually the best father to pick for him is Azel, due to letting him have Minor Fala blood and Tordo together which will grant him high Skill and Magic. He will also have a good skill combo Pursuit and Wrath which will allow him to plow through enemies, due to being able to attack twice with Wrath, something Tailto could not do due to lack of Pursuit. Another popular choice is having Lewyn be the father, because Arthur will inherit Forseti from the start. However, he will lack Pursuit and will not double often with Forseti. A Pursuit Ring is best for him if you go with this pairing.
Arthur was a mythical king of England who wielded the Excalibur and was aided by his Knights of the Round Table, as well as Merlin and his wife Guinivere. He met a morbid end, due to wounds suffered from his nephew/son Mordred.
Since Tailto arrives in the game together with Claud, they are often paired together by beginner players. While this will lead to Arthur joining Seliph's army with the Valkyrie Staff in his inventory, he will be unable to use it due to class restrictions. This phenomenon has been adapted into a running gag amongst the creators of the Fire Emblem: 4-koma Manga, where Arthur's attempts to call upon the powers of the staff often result in him either utilising it in an unskillful manner, or even harming his allies with offensive magic.