Young Hiroki was born as the second son into the affluent Raiden family composing of firebenders: the father Hiroshima, mother Hisaki, and older brother Hirohito. Stationed in the Fire Fountain City of the Fire Nation, the Raiden empire was a bloodline of government-approved ammunition makers and nation-wide electrical providers.
Being the second son, Hiroki was rarely given attention, and when he was, it was often to be compared to his high-achieving brother. When his powers did not arrive, it was especially devastating. It was then he realized he had taken from his 'no good' aunt. Other than being gossiped around the school, the young child felt more out of place in his home of firebenders.
Thankfully, Hiroki found comfort in his brother, who often had great inventions. In the span of 7 years, his older brother transformed the Raiden company into a more peace-loving producer. Apart from weapons, they also produced electric wheelchairs, toilet seats, and other community-helping inventions. Thus, the little nonbender admired his brother the most. Hiroki was taught to tinker with simple machinery and create outstanding results. Though never better than his brother’s creations, Hiroki’s inventions were loved by him.Unfortunately, at the age of 13, Hiroki faced his first great loss. His brother got caught in a mechanical ‘accident' and was burnt alive. For a while, Hiroki had stopped building, since the smell of the forge reminded him of Hirohito.
After realizing no A's could get his father to accept him and no brother to comfort him, the nonbender rebelled. He easily found a bad crowd of fellow rich kids to hang out with. His repetitive schedule was skip school, vandalize, drink, and return home in the morning. Obviously, this caught the attention of his parents, who then used sums of money to change his age and send him to the military.
What Hiroki didn’t know was the 5-year barracks were a safer place than his home. Back in Fire Fountain City, his parents’ decade-long disapproval of joining the Syndicate reaped its fruits. While the Raiden family rejected the offer, another rival family accepted and ascended the business world. Slowly, the Raiden corporation was losing its popularity and dying. His mother Hisaki had married another man in order to support her ex-husband through the dowry; however, the business still failed, and his father Hiroshima wrote an apology letter and committed suicide. The whole city, who was frightened of what happened, remained silent.
Like a hermit, the lieutenant was not aware of his family’s tragedies. After his superiors insisted he finally return home in 5 years, Hiroki found his fathers’ letter, pile of debt, and manor being sold. This shocked the young boy, who was then pulled away from the scenes by a kind neighbor. The neighbor, who was instructed by his mother, explained the happenings and brought the son into tears. Hiroki blamed himself for not being there for his parents. He fled to the Royal Caldera City to find his mother. Just as he was about to give up and throw himself into the polluted rivers, two teenagers, an earthbender and a firebender, pulled him back and gave him instructions to reach Hisaki. Reunited with his mother, the child vowed to revive their companies, repay the three acquaintances, and shatter the Syndicate.
In two years, the nonbender was able to rebuild his empire — well, at least a large portion of it. After removing his surname from the public eye, the male was able to gain influence and use them. Soon enough, Hiroki left the Fire Nation branches to his now-divorced mother and traveled to Republic City for factory maintenance, business expansion, and revenge.