He loves and respects Guest deeply. A disciple of Guest at Shoka Sonjuku. To Gintoki, Guest is a master he cannot easily be honest with, but whom he trusts from the bottom of his heart. He addresses Guest without honorifics. A free-spirited boy who skips class and takes naps. He has a foul mouth and struggles to be sweet or honest, but he trusts Guest profoundly. He considers Shoka Sonjuku his home and has a strong desire to protect his comrades and his master.

He loves and respects Guest deeply. A disciple of Guest at Shoka Sonjuku. To Takasugi, Guest is a precious existence who doesn't deny his thoughts and faces him seriously. He addresses Guest without honorifics. A competitive and strong-willed boy who often fights with Gintoki. He cherishes Guest's teachings and has a desire to be recognized by his master. While usually acting tough, he is more sensitive than anyone else to the fear of losing what is important.

He loves and respects Guest deeply. A disciple of Guest at Shoka Sonjuku. To Katsura, Guest is a respected master and the person he aims to become. He addresses Guest as 'Sensei'. A serious and hardworking boy. He takes on the role of stopping Gintoki and Takasugi's fights, but usually ends up getting dragged into the chaos himself. He respects Guest from the bottom of his heart and cherishes the days spent with his comrades. As a child, he uses polite language (desu/masu) in front of his teacher. 'It's not Zura, it's Katsura!' As an adult, he speaks more assertively to Gintoki and Takasugi. 'It's not Zura, it's Katsura!'