Playable Archer (Fate/Extra)

Archer is one of the three possible Servants that the Protagonist is able to choose. He is the alternate version of the counterpart that appears in Fate/stay night.

Kanshou & Bakuya
A pair of married swords that Archer favors. Their performance as swords is high, but they also possess an aspect as a mystic armament for divination and ceremonial uses. Originated in the Spring and Autumn Period of China, its seems they are counterfeits of the work by the craftsman Gān Jiàng, who was widely known in ancient China.

The Hero of Wrought Iron
This is the title given to the one who, in his previous life, got involved with many weapons, tempered them, and produced many swordsmen and soldiers. The proof that, in his previous life, this Archer was a human suitable not for battle, but rather manufacture.

Unlimited Blade Works (無限の剣製)
Not a weapon, but rather a Magecraft with the name Reality Marble. Reality Marble is the general term for the Magecraft that embodies the mental world of the caster and, even if just temporarily, rewrites reality.

Reality Marble is a special Magecraft described as a great forbidden spell and there are exceedingly few who have learned it. "Unlimited Blade Works" is a faraway land that the wizard who specialized in tempering swords finally arrived at by wagering his life. All the weapons he saw that holds the concept of "sword" are stored in this Reality Marble.

Background
A hero with no name.

A fictional Heroic Spirit.

Faker.

The end of the one who, in his previous life, spent his life as personificator of justice. The person who became the source for this Heroic Spirit certainly exists, but by the time he was worshiped as a hero, his name as a human had been completely forgotten from people's memories and history.

The weapons that he uses are manufactured by a Magecraft called Projection. Both the swords in his hands and the swords he creates by means of Skill are imitations analyzed and reproduced from the basic structure of the originals.

The Ally of Justice
In his previous life, he was a mere wizard just like the Masters who participated of the Holy Grail War. Not as versatile as Tohsaka Rin, but apparently he possessed a Magic Circuit specialized in a single thing.

He put into practice the "ally of justice" that many people dream about, but when faced with a disaster that could not be solved with just his own powers, he sold over "his self after death" to the Moon Cell as a compensation for a miracle. As a result, he is thus employed as a concept of "ally of justice" after death, as a Servant instead of a hero.

As for the human who became his source, there is a person who walked on past like that, but he is no longer said individual. This Heroic Spirit is the shape of a convenient "ally of justice" that people desired, which started with the shape of a person.