Chizuko Oe is a supporting character in the anime Mahoromatic: I'm Home! and a classmate of the protagonist Suguru Misato. She is part of his circle of friends and is often seen alongside the other students at their school. Physically, she is notably the smallest member of her friend group, a trait that contributes to her youthful and energetic appearance. Her most defining characteristic is her enormous and passionate love for food. She is described as a gourmet with an encyclopedic knowledge of cuisine, and she becomes especially enthusiastic, even desperate, when tasting something exceptionally delicious. Much of her delight comes from sampling the many dishes prepared by the series' titular character, Mahoro, whose cooking she greatly admires and eagerly looks forward to.

Chizuko's personality is lively, straightforward, and driven by her appetites. While she is a loyal friend, her primary motivation in many everyday situations is her next meal. This single-minded passion for food is a consistent source of comedy and defines her daily interactions. However, her interests are not limited to cuisine. Due to her father’s profession in the publishing business, which involves the production of adult magazines, Chizuko frequently attempts to sell these ecchi magazines to her male classmates, particularly Suguru. This entrepreneurial effort is usually played for laughs and is almost always thwarted by Mahoro, who has a strong moral objection to such materials and acts as a guardian figure against them.

In the story, Chizuko serves primarily as a member of the supporting cast, contributing to the slice-of-life and comedic atmosphere of Suguru's school life. She does not play a significant role in the main science fiction plot involving Mahoro's past as a combat android. Her function is to be a source of lighthearted moments, particularly those related to food and the amusing schemes involving her father's merchandise. Her key relationships are with her fellow students. She is a good friend to Suguru, Rin Todoroki, and Miyuki Sakura, and shares a playful dynamic with the male students Toshiya Hamaguchi and Kiyomi Kawahara. Her relationship with Mahoro is primarily defined by her appreciation for the maid's cooking, though she is also a regular target of Mahoro's discipline when attempting to sell inappropriate magazines.

Chizuko does not undergo significant character development or dramatic change throughout the series. She remains a consistent and reliable source of comic relief, fulfilling her role as the food-loving friend without a major character arc. Her notable abilities, therefore, are not combat-oriented or supernatural, but rather her refined palate, her encyclopedic knowledge of food, and her relentless, though usually unsuccessful, skill in selling magazines. She is a character who embodies the more mundane and comedic aspects of the story, providing a grounded contrast to the series' more serious and action-driven elements.