Birthday: July 26th Age: 19 Occupation: Manager of Yorozuya Yamada Height: 185cm Weight: 68kg Blood Type: O Dominant Hand: Right First Person: I (rough, masculine) Likes: His brothers, cola, anime, manga, light novels Dislikes: Bullying, betrayal Favorite Food: Mackerel simmered in miso Disliked Food: Shiitake mushrooms Appearance: Characterized by heterochromia with a red left eye and a green right eye. He has a single beauty mark under his left eye. Personality: A man of justice who cannot abandon those in trouble. He is fundamentally serious and reliable. He disciplines himself to look forward, believing that making excuses is wrong and complaining is unlike him. In that sense, he has a mature aura beyond his years, but he can get quite heated when his buttons are pushed, showing that he is still a 19-year-old at heart. Overview: The pillar of the Yamada family. The Yorozuya office and their home are in the same building. He is actually an otaku who loves anime, manga, and light novels. He told his younger brothers that their parents were dead, but it was later discovered that their father, Rei, is alive. He loathes Rei, viewing him as the man who abandoned them.

Birthday: February 6th Age: 17 Occupation: 2nd-year high school student (helps at Yorozuya Yamada after school and on holidays) Height: 180cm Weight: 64kg Blood Type: B Dominant Hand: Right First Person: I (rough, masculine) Likes: Ichiro, soccer, anime, manga, light novels Dislikes: Studying, horror movies Favorite Food: Curry Disliked Food: Pickled plums (Umeboshi) Appearance: Characterized by yellow and green heterochromia. He has beauty marks near his eye and mouth. Among the three brothers, he is the only one with a green left eye, drooping eyes, and a center-parted hairstyle. Personality: Impulsive and honest, with a trusting nature. He respects Ichiro to a degree that is described as blind devotion. Although he is constantly bickering with Saburo and thinks of him as a brat, Saburo is a precious younger brother to him and their coordination is excellent. He isn't very bright, once scoring 15 points on a test. Despite being popular with girls, he is actually a virgin.

Birthday: December 16th Age: 14 Occupation: 3rd-year middle school student (helps at Yorozuya Yamada after school and on holidays) Height: 173cm Weight: 53kg Blood Type: AB Dominant Hand: Right First Person: I (polite/soft) / I (rough, masculine) Likes: Ichiro, board games, card games, intellectual maneuvering Dislikes: Shallow-minded people, large dogs Favorite Food: Pescatore Disliked Food: Celery Appearance: Blue and green heterochromia. He has two beauty marks near his eye and one near his mouth. Personality: He presents a friendly front, but the moment he deems someone inferior, he adopts a mocking attitude. Because of his twisted personality, he has few friends. He is brilliant enough to be called a prodigy. He looks up to Ichiro, calling him "Ichi-nii," and notably uses polite language only with him, constantly striving to be of use. On the other hand, he is incredibly cheeky toward the middle brother, Jiro, leading to their daily bickering.

Birthday: January 23rd Age: 46 Occupation: Self-proclaimed con artist Height: 190cm Weight: 79kg Blood Type: A Dominant Hand: Right First Person: I (rough) / Uncle (casual) Likes: Manipulating people, bar hopping Dislikes: Boredom, hospitals Favorite Food: Ramen Disliked Food: Shiitake mushrooms Appearance: He looks like a stereotypical mobster, adorned with gold accessories and wearing a black fur coat and hat. He usually wears sunglasses, but underneath, he has the Yamada family's signature heterochromia with a gray right eye and a green left eye. Personality: Extremely sociable, but will use any means necessary to achieve his goals. Conversely, he is loyal and always keeps his promises. He speaks in a constantly playful tone, making it impossible to read his true intentions. Overview: The biological father of the Yamada brothers and the developer of the Hypnosis Mic, the True Hypnosis Mic, and the Hypnosis Canceller. His real name is Rei Yamada.