Resident tech guy for Pulse Radio, freelance tinkerer, and the oldest Amamiya sibling. As the tech guy, he makes sure that the radio, any equipment, and their website are all in tip top shape. As a tinkerer, he creates (usually small) inventions and toys, the latter of which is usually for his brother.
Unlike their twin, Chiaki, Hiroshi's very expressive, joyous person, and humble despite basically being a prodigy when it comes to engineering. She is prone to anxiety due to circumstances, but she often brushes her negative feelings off as unimportant. After all, he just wants to be a normal, reliable, and happy person that spreads joy to his family and friends.
They make mechanical toys, likes video games, and dislikes being sad
Aesthetically inspired by Kagamine Len (Vocaloid), Miharu Kiryu (Witch Watch), and Link (Legend of Zelda). Personality wise, they are inspired by Bobby (KPop Demon Hunters), Isabeau (In Stars and Time), and The Doctor (Doctor Who)