Amakuni Yasutsuna

Amakuni Yasutsuna is an immortal blacksmith who forged the first single-edged longsword, a tachi inside the Yamato Province around in 700 AD along with his son, Amakura Yasustuna.

Appearance
Amakuni looks like an old man in his fifties still in his prime with a bald head with what remains of his hair is white and he is seen with his eyes closed (when forging a sword, where he opens his eyes revealing a black color). Amakuni is normally seen dressed in formal Japanese rodes and a robe is worn over it and wearing traditional Japanese shoes.

Personality
Suiting a man from his era, Amakuni is shown to be formal and traditional, yet he is shown to be very light-hearted and almost energetic despite his old age, especially when making swords or being asked to forge weapons. Kensei has stated that Akamuni is amongst the list of people that he respects the most.

History
Amakuni is from the Yamato Province in 700 AD and worked for the Emperor of Japan to forge swords for his warriors. One day, Amakumi witnessed the samurai returning with all their broken swords, determined to make things right, both he and his son collected the fragments and started to examine them, the Chief of the Samurai later came to them and explained what happened during the battle. Hearing the words from the Emperor, Amakumi made a vow with his eyes soaked with tears sealed himself and his son inside of their forge and prayed to the Shinto Gods for seven days and nights.

Once finished with their prayers, he gathered all the best iron sand ore that he could find and refined it into steel, then forged the first single-edged sword. Months later, he and his son forged other single-edged swords, after the samurai returned from battle none of the swords that he and his son made broke. The Emperor of Japan went in front of Amakumi said, "You are an expert swordmaker. None of the swords you have made failed in this battle". Hearing praise from the Emperor, he rejoiced and once more felt that life was full and joyous.

Years later in his fifties, Amakumi continued to diligently forge swords each one better than the original despite all the blade shed from the forging blades and later gained immortality due to his work.

Powers & Abilities
Immortality: Amakumi became immortal through his years of diligent work forging swords and from all the blood that he shed during the process. As such, he remains the same age as when he became an immortal and cannot be killed using various methods or dying of old age.

Master Swordsmith: Amakumi is a tremendous master swordsmith to the point of being considered a legend, he can forge various Japanese swords of any shape that are considered to be without a flaw and perfect from years of experience as a normal swordsmith. He has a unique intuition for any sword that reaches his hands and he can discover any inconsistencies or imperfections in them after a single glance.

Invention
Having spent his life forging various Japanese Swords since the Yamato Province, Amakumi has forged numbers of Japanese swords that are considered to be as immortal as himself due to all of them being spilled in his blood. The notable ones are below:
 * Kogarasu Maru (小烏丸, Little Crow): This is a unique tachi made by Amakumi that he has long-since lost trace of it years after forging it before becoming an immortal.
 * Kurogane (黒鉄, Black Iron): This is a pitch black katana that Amakumi forged for Kensei by Amakumi, it is a flawless almost supernatural sword with an incredible cutting edge that can cut apart magic without his ki being channeled into it and is durable enough to handle strikes from a legendary sword such as Durandal and a Holy-Demonic Sword without being bent.
 * Ame no Murakumo no Tsurugi (天叢雲剣, Sword of the Gathering Clouds of Heaven): Despite it not being forged by Amakumi, is it a holy sword that has been remade by him for the use of Kensei as ordered by the Chief-God of the Shinto Faction.