Hitomi Shizuki is a supporting character and a second-year student at Mitakihara Middle School, where she is classmates and close friends with both Madoka Kaname and Sayaka Miki. She comes from a very affluent, well-regarded family and carries herself with an air of elegant refinement. Hitomi serves as the class monitor and is known for being a diligent student who applies herself seriously to her studies. Her upbringing includes a demanding schedule of traditional after-school activities such as piano, classical Japanese dance, and tea ceremony, which she feels obliged to attend even when pressured by academic responsibilities.

In terms of personality, Hitomi is consistently polite, kind, and well-mannered, often speaking to even her closest friends with a degree of formal respect. She is considered very popular and frequently receives love letters from male admirers at school. Despite her composed and gentle demeanor, she can occasionally display a naive or oblivious side, such as when she initially misinterprets the deep friendship between Madoka and Sayaka as a romantic relationship. When it comes to matters of the heart, however, she demonstrates a strong and principled sense of fairness.

Hitomi's primary motivation and most significant role in the story stem from her feelings for Kyousuke Kamijou, a talented violinist and childhood friend of Sayaka. Having long noticed Sayaka's unspoken crush on Kyousuke, Hitomi believes in a fair competition. She confronts Sayaka directly, giving her a clear ultimatum: Sayaka must confess her feelings to Kyousuke by the next day, or Hitomi will do so herself. This act is born from a desire to respect her friendship with Sayaka while also being true to her own emotions, but it ultimately has tragic consequences. When Sayaka fails to act on her feelings, Hitomi follows through on her promise and begins a relationship with Kyousuke, an event that contributes significantly to Sayaka's emotional spiral into despair.

Hitomi is also briefly placed in direct supernatural danger when she falls under the influence of a Witch's kiss. She is seen in a trance-like state, preparing to participate in a mass suicide along with other affected people until she is saved by Madoka and Sayaka, though she remains unaware that she was rescued by a magical girl. This event underscores her role as a representation of the ordinary, non-magical world. She is a close friend who is completely shielded from the truth about Witches, Soul Gems, and the suffering that magical girls endure, making her an unwitting but powerful catalyst for the drama unfolding within her friend group.

In the story of the film, Hitomi's key relationships remain central. Her friendship with Madoka is warm and supportive, while her bond with Sayaka is deeply tested by the love triangle. Following Sayaka's fate, Hitomi is shown to be profoundly saddened and wracked with guilt, blaming herself for the tragedy that she believes stemmed from their conflict over a boy. This grief highlights the development of her character, moving her from a naive and slightly sheltered girl to someone who must grapple with the heavy, real-world consequences of her actions.

Hitomi has no magical abilities whatsoever and never becomes a magical girl. Her notable skills are entirely mundane but refined, stemming from her privileged upbringing. She is highly gifted in traditional arts like the tea ceremony and Japanese dance, as well as Western classical piano. Her intelligence and ability to manage a demanding schedule of extracurriculars while maintaining excellent grades are also noted. In her ordinary life, these are her strengths, but in the context of the series, her normality and lack of awareness serve as a tragic contrast to the magical conflict that ultimately consumes her best friend.