Hiiro is not very familiar with the societal norms of the city, and often acts overly familiar with others. He is inquisitive and enjoys learning about his new surroundings. He tends to take things literally and act on impulse. Hiiro is very passionate about achieving his goals. However, he has a one-track mind and often develops tunnel vision because of this, something his brother scolds him for.and is often regarded as a genius by his peers.