Aiko Hageda is the mother of Hagemaru Hageda and the wife of Yuji Hageda, belonging to the Hageda family recognized for their frugal lifestyle and aversion to spending money. She possesses brown hair, brown eyes, and a tall, slender build. Her typical attire includes a blue shirt, a red or maroon skirt covered by a yellow apron, and purple sandals; once, she wore a brown fur coat crafted from the family pet Pesu's fur paired with a purple skirt.

Aiko embodies the family's intense focus on saving money and consistently avoids expenditures. She enjoys money, food, coats, watching television, and sleepovers. Her dislikes center on spending money and purchasing items, with weaknesses arising in situations involving money. Her hobbies include household activities and playing the piano during her childhood.

Flashbacks depict aspects of Aiko's childhood, featuring figures named Tonarida and Nissin as father figures, and Spomi, Lucy, and Michelin as mother figures. Kondo's mother appears as both a friend and rival during her youth.

Within her family, Aiko is married to Yuji Hageda, an office worker who wears formal attire. She is mother to elementary school student Hagemaru, who wears pink clothing. While her overall demeanor appears less outwardly affectionate than other family members, she holds deep love for her son. The family owns a pet dog named Pesu, who sometimes comments on their extreme thriftiness.

Aiko's role involves managing domestic affairs while strictly adhering to the family's money-saving principles. Her personality combines practicality with an underlying care for her family, particularly her son, despite the overwhelming emphasis on financial conservation.