(Madao) is introduced as an official working for the Bakufu, but after an incident with Amanto dignitary Prince Hata, whom he was assigned to serve and protect, his superior asks him to succumb to his shame and commit seppuku, hearing which he ran away from his quarters. Although his wife, , also leaves him, they never get divorced as both are still in love. Hasegawa initially believes that humans should focus on appeasing the Amanto, but after his encounter with Gintoki his mindset changes. Since then, he has been living a life of somewhat like a loser, getting fired almost every time he gets a new job, mostly due to the unfavourable look his sunglasses and goatee give him. No matter what, he refuses to remove his sunglasses because it is the only thing he has left to remind him of his successful past. He is often referred to as , which stands for in Japanese, among a whole host of other funny descriptions utilising the initial syllable of each word. He and Gintoki become friends and spend most of their free time gambling. His name is based on the historical Hasegawa Heizou.
