Intetsukijin (Spirit)

Intetsukijin (陰鉄鬼神, lit. "Shadow Iron Demonic Psyche") is the manifestation of the ancient and deadly which has existed for many millennia; precisely, it's the amalgamation of the spiritual essences collected and trapped within its steel confines — acting as a representative of all those it's mercilessly enslaved. According to Seijūrō Arakami — the blade's current and most powerful master, she often addresses herself as a, even though such a thing is impossible as Seijūrō is unable to imprint his very being onto the Asauchi due for rather obvious reasons; however, such a statement can be validated given its origins and powers, which isn't much different from other Zanpakutō.

Alternatively, she refers to herself as "Nioh Kurikara" (仁王倶利加羅, lit. "Benevolent King's Dragon Carving") — denoting to her original purpose before her eventual "corruption".

Trivia

 * According to the author, the reason why he chose Musashi Miyamoto from the mobile game, Fate/Grand Order, as Seijūrō's "Zanpakutō Spirit" is because her warrior-like appearance and Noble Phantasm covers the various points about the weapon's overall abilities and denotes to its origins. In addition, her appaearance is very similar to her current master, specifically their height, fair skin, and silver hair — which the author counts as a bonus.