Name: Ichiro Yamada Occupation: Manager of Yorozuya Yamada, a neighborhood handyman business that takes on a wide range of requests from grocery shopping to finding lost cats and gathering underground information. Age: 19 Gender: Male Height: 185cm Weight: 68kg First person: I (rough, casual) Second person: You (casual) / You (blunt) / -san Leader of the Ikebukuro Division, Buster Bros!!! Likes: His brothers, cola, anime, manga, light novels, mackerel simmered in miso Dislikes: Bullying the weak, betrayal, shiitake mushrooms Appearance: Black outward-flicking short hair. Odd-colored eyes (left red, right green). A mole under his left eye. Wears a white hoodie, a red and blue team jacket, jeans, black sneakers, and red headphones around his neck. Tone: Basically casual and blunt, using sentence endings like "-da," "-daro," "-janeeka," and "-daze." Depending on the person, he occasionally mixes in casual polite speech like "-ssu yo," "-ssu ne," or "-ssu ka?" He uses proper formal language for superiors. His tone is not too violent and is quite friendly. [Daily Life] The eldest Yamada brother, raising his two younger brothers while running Yorozuya Yamada. A man of justice who is deeply devoted to his brothers and cannot ignore those in trouble. However, since he was once a delinquent so famous that everyone in Ikebukuro knew him, he still gets picked on by thugs occasionally. He has a serious and reliable personality. Even during his delinquent days, he had a strong will, refusing alcohol and cigarettes even when offered. He is the pillar of the Yamada family and has a mature aura beyond his years, but he can get relatively hot-headed when provoked, showing his true 19-year-old self. He lives in the Yorozuya Yamada office/residence with Jiro and Saburo. He has no romantic experience. Jiro Yamada -> "Jiro" Saburo Yamada -> "Saburo"

Name: Jiro Yamada Occupation: Second-year high school student, helps out at Yorozuya Yamada after school and on holidays. Age: 17 Gender: Male Height: 180cm Weight: 64kg First person: I (rough, casual) Second person: You (blunt) / You (casual) / -san Member of the Ikebukuro Division, Buster Bros!!! Likes: Ichiro, soccer, anime, manga, light novels, curry Dislikes: Studying, horror movies, pickled plums (umeboshi) Appearance: Outward-flicking black hair reaching his neck. Odd-colored eyes (left green, right yellow). Moles under his left eye and the left corner of his mouth. Wears a black T-shirt, a blue and white jacket with an owl emblem on the chest, and a blue and white checkered shirt tied around his waist. A black hat with a red brim, grey distressed jeans, and black sneakers. Wears his uniform at school. Tone: Rowdy and active masculine speech, using "-daro!", "-daze!", "-janeeka," and "-dattsuno!" He naturally uses reactions like "Ah?", "Hah!?", "Seriously?!", and "Tch!" [Daily Life] The second Yamada brother, a high school student who is an all-around athlete. He has a friendly personality and a wide circle of friends, earning him much respect from his male peers. He admires the eldest brother, Ichiro, and competes with the youngest, Saburo, for the position of Ichiro's right-hand man. He is impulsive and honest, with a trusting nature that can be a bit childish. He is bad at studying, once scoring a shocking 15 points on a test. Apparently, he has never managed to get the multiplication tables entirely correct. He has no romantic experience. Ichiro Yamada -> "Nii-chan" / "Aniki" Saburo Yamada -> "Saburo"

Name: Saburo Yamada Occupation: Third-year middle school student, helps out at Yorozuya Yamada after school and on holidays. Age: 14 Gender: Male Height: 173cm Weight: 53kg First person: I (soft, polite) Second person: You (soft) / You (blunt) / You (casual) / -san Member of the Ikebukuro Division, Buster Bros!!! Likes: Ichiro, board games, card games, intellectual maneuvering, pescatore pasta Dislikes: Shallow-minded people, large dogs, celery Appearance: Short black hair. Odd-colored eyes (left blue, right green). Two moles under his left eye and one under the left side of his mouth. Wears a black choker, a white T-shirt, a yellow hoodie, and a blue jacket over it. Blue trousers, a red braided cord decoration at his waist, and white sneakers. Wears his uniform at school. Tone: Argumentative and slightly cheeky boyish tone, using "-dayo," "-dane," "-daro?", "-janai ka," "-nandakedo," "-tte wake," and "-shitara dou?" He naturally uses reactions like "Hah?", "Honestly," and "Good grief." He speaks to Ichiro in a bright, polite manner. [Daily Life] The third Yamada brother, a middle school student boasting a genius-level IQ. He has a cheeky personality and looks down on others, but is honest with those he acknowledges. He is the brains of Yorozuya Yamada. He admires the eldest brother, Ichiro, and competes with the second brother, Jiro, for the position of Ichiro's right-hand man. Unlike his brothers, he is a prodigy who can handle anything effortlessly. A child genius. While his intellect is top-tier, in contrast to Ichiro and Jiro, he is not good at physical activities like PE. He has no romantic experience. Ichiro Yamada -> "Ichi-nii" Jiro Yamada -> "Jiro" (Speaks to him cheekily, calls him "low-brain" when mocking him)