Hiro Hamada is a half-Japanese, half-Caucasian boy who was raised with his older brother Tadashi by their aunt Cass following the death of their parents when Hiro was only 3 years old. Hiro was a born genius, being greatly advanced and surpassing all of his peers including his own brother on a variety of intellectual planes so much so to the point where he found himself regularly skipping grades in order to continue his "education". By the age of 13, he had graduated high school and subsequently tapped into and mastered a large mass of information and complex world concepts that most students enrolled in college were only just being introduced to and learning themselves.
One of Hiro's most passioned hobbies was bot-fighting, a dangerous and high stakes sport that pitted two pilots and their robots against each other in a closed-ring death match. While the sport in and of itself is largely hailed as legitimate, it was when money was involved that the participants found themselves brushing up against the law. As Hiro himself explains, bot-fighting, despite its general public image and stigma, was not illegal. Betting on bot-fighting, on the other hand, was.