Father is a middle-aged salaryman who works in downtown Tokyo, commuting to his job by train rather than by car, though he does own a blue hatchback coupe for other uses. He was born in Ōita Prefecture, a detail that occasionally surfaces in his speech patterns, as he retains a slight country accent despite his urban profession. As a traditional Japanese working father, his habits include drinking beer heavily, smoking frequently, and spending time at pachinko parlors. On his Sundays off, however, he makes an effort to be helpful and present for his family.

In personality, Father is predominantly a stoic and quiet individual who typically shows little emotion and communicates in short, often one-word phrases. He values a clean and tranquil home environment. Despite his reserved exterior, he has a more complicated inner life. He is portrayed as being somewhat naive, occasionally mischievous, yet ultimately thoughtful. He finds genuine entertainment in the bizarre or exaggerated behavior of his wife, often watching her antics with detached amusement as if observing a show. However, when a situation directly inconveniences him or disrupts his own routine, he can suddenly become irritable and lose his patience. When he makes a mistake or finds himself in an awkward position, his characteristic response is to let out a simple "Ha, ha, ha". He also has a sentimental side, frequently looking back fondly on the days when his children were small, a wistfulness that the rest of the family does not always understand.

One of the most significant events in his past is the death of his mother. She passed away just before the birth of his son, Yuzuhiko. Father was on an airplane traveling to Ōita to visit her in the hospital when she died. In a rare and powerful display of emotion, he wept openly at her butsudan (Buddhist altar), an act noted as the first time he had shown such vulnerability since his marriage.

Within the family structure, Father acts as a quiet, sometimes distant patriarch. He shares a relationship with his wife, often referred to as Mother, that is defined by unspoken understanding and her efforts to manage the household. While he is frequently the target of her frugal or unconventional methods, he tends to observe her struggles with a sense of detached entertainment rather than active participation. His relationship with his daughter, Mikan, and his son, Yuzuhiko, is colored by his nostalgia for their early childhood. Although he may appear uninterested in their daily teenage concerns, he is noted to have a natural and gentle way with very young children and babies. In the home, he has a few notable quirks, such as a tendency to leave the bathroom door open and, when drunk, a habit of randomly packing up household items to throw away, much to his family's exasperation. He is also easily frustrated by modern household appliances when they do not function as expected.

He is a character defined by a strong adherence to his own, often unspoken, routines and preferences. He insists on doing things his own way. This stubbornness, combined with his quiet nature and dry sense of amusement at his family's chaos, makes him a stable, if unconventional, presence in the household. While he may not be openly affectionate or communicative, his actions, such as being present on his days off and his deep, if private, familial feelings revealed through his nostalgic memories and grief for his mother, demonstrate a underlying foundation of care and connection to his family.