Kaijin

kaijin (カイジン) was a skilled blacksmith hailing from the Dwarven Kingdom and the brother of Kaidou. Following his exile from his homeland, he found a new purpose as a devoted subordinate to Rimuru Tempest. His unwavering dedication played a crucial role in the establishment of the Jura Tempest Federation during its foundational phase. Kaijin now serves as an esteemed member of the federation, collaborating closely with Vesta, the Minister of Science, as a fellow researcher.

Appearance
Kaijin, akin to his fellow dwarves, possesses a diminutive stature coupled with a robust, muscular physique. His distinct features include rich brown skin, accompanied by a luxuriant, bushy beard that frames his countenance. His piercing blue eyes exude an air of determination. Adorning his form, he dons a resplendent ensemble: a pointed, earth-toned hat embellished with perched goggles atop, while a regal purple shirt, embellished with fur pelts at the sides, graces his upper body. A cloth of complementary hue conceals his waist, and sturdy brown boots complete his ensemble with finesse.

Personality
Despite his seemingly gentle exterior, Kaijin is, in fact, an exceedingly prudent and wise elder. His dedication knows no bounds, as he diligently contributes to Rimuru's ambitious undertakings without a hint of complaint. Confident in his blacksmithing prowess, he remains resolute and unwavering. An affinity for his craft is evident in his animated discussions with fellow blacksmiths like Kurobe, engaging in protracted conversations about weaponry and related matters.

Kaijin's character possesses intriguing facets, including a playful and slightly mischievous side. His mischievous tendencies are unveiled through his consideration of constructing a mixed-gender bath with an ulterior motive of voyeurism, an idea promptly quashed by Shuna and other females. He also partakes in recreational activities like visiting an elven hostess bar, exemplifying his inclination to relish life's pleasures.

However, one of his most commendable traits is his commitment to honoring his promises. This virtue becomes evident in his pact with Rimuru to contribute to the village's establishment, contingent upon crafting ten magical swords within a specified timeframe. Even in the face of adversity, such as when he was unjustly blamed for the artificial magic soldier project's failure—a responsibility that rightfully lay with Vesta—he never harbored resentment. Despite being removed from the Dwarven Engineering Corps, he bore no grudges.

Furthermore, his protective nature over his friends shines brightly. His fierce reaction to insults thrown at his comrades was evidenced when he confronted Vesta after the latter disrespected Rimuru. This protective streak showcased his willingness to stand up for those he cares about, regardless of rank or authority.

Background
Kaijin was born a commoner but thanks to having made it up to the position of a commanding officer, he was granted the status of a semi-baron. He eventually joined the Dwarven Engineer Corps alongside Vesta, with the two being bitter rivals since their time in the military. This relationship continued even when as fellow researchers.

Without having produced a single technological innovation, the dwarven engineer corps were resigned to being the least evaluated corps. The engineer corps was split into two factions, Vesta's and Kaijin's. Vesta's faction insisted that considering that their country is the founding nation of technology, the engineer corps should be the star of the knight order. Kaijin's faction refuted, instead advocating that they should steadily advance their research, as they had done up till then. The arguments of both sides only resulted in a clashing of opinions, and their meetings never ended in a conclusion.

And it was during that period of struggles, that one elf engineer had initiated a joint development plan that was named, the "artificial magic soldier project." Vesta had wanted to make that project succeed no matter the cost, all in order to redeem the honor of the engineer corps, once and for all. Although Kaijin had pointed out that Vesta was being too impatient, he had paid no heed at all, because the warning was given by a superior of commoner's descent. At that time, only the best engineers had assembled to participate in the project. But as a result of his over-eagerness, Vesta ended up causing the rampage of the "enchanted soulstone," and the project was brought to a standstill. And it was in this way, that the "artificial magic soldier project" met its demise.

At the end of the day, Kaijin was the one to take full responsibility for that failure and was forced to leave the army. This was because Vesta, on top of pushing all blame onto Kaijin, had even bribed the upper echelons of the army to prepare false evidence.

Kaijin and his company were reluctantly banished from Dwargon by Dwarf King Gazel. That happened after his altercation with Vesta, who had insulted the newcomer slime Rimuru, an honored guest and savior of his compatriots. In truth, however, he wanted to work under Rimuru as his expert blacksmith in the growing nation of Tempest, rather than have to face Vesta again. It was thanks to him and the other dwarves with him that Tempest became a proper civilization.

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