Kuroda Tamayuiki Tatsu is the oldest living heir of the Tatsu family, the current shogun of Tekkan, and the first shogun of the Tatsu sovereignty. He is an important figure in the pivotal event that furthered Tekkan into the industrial era and the end of the Seigun Shogunate in 3112 RH. He was considered an honorable daimyo of Seigun standards, which made it easier for them to forfeit their position to Tatsu, which later turned false after he betrayed Seigun Law by attempting to invade the Haisong Kingdom and exploitation of new-age technologies and azure oil, whence he held a great obsession for. 

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Despite possessing the rank of Shogun, a title meant under the protection in a castle. Kuroda was present in most of his battles and often displayed himself in his bulking body armour known as yakubyō-yoroi (literally meaning "Volcano Armor"); an immense piloted machine built to replicate the traditional samurai body wrap in a modernized sense. It is powered by steam, laced with azure oil, and protected in multiple layers of refined metal.  While the suit limits the wearer's agility, it grants them an overabundance of strength allowing them to carry large artillery parts that would normally require the strength of ten men to carry, such as the Ōzutsu; an iron handheld cannon invented by Clan Tatsu normally used for siege battles but can be used as a regular gun while wearing the yakubyō-yoroi. Kuroda also commissioned a set of spinning blades at the bottom of the barrel that could cut through stone. He bore this weapon and wore the armor in the battle of Azuhanto in 3124 RH, where he overpowered 3 seigun by himself. Resulting in his entire left arm being severed. 

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After the Battle of Azuhanto, Kuroda and his army were forced to retreat from their campaign of overseas conquest for now. Angered, Kuroda ordered a man-hunt for any seigun ronin still alive and torch their estates, relics, and history to cinders. Including the vacant castle of the former seigun shogunate in Azuhanto, which remained a remnant of the past up until then. Kuroda today sits within his castle, plotting to resume the overseas conquest, ignorant of the troubles Tekkan faces. 

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