Miki Hanakain is a central character in the anime series Tenshi na Konamaiki, known in English as Cheeky Angel. She is a fifteen-year-old girl who serves as the childhood friend of the protagonist, Megumi Amatsuka. Miki comes from an immensely wealthy and influential family, the Hanakain clan, whose lineage traces back to ancient Japan, and she is the sole heir to that legacy. Despite her privileged background, Miki is initially presented as mild-mannered, proper, and often timid. However, beneath that reserved exterior lies a fiercely loyal and quietly determined person, especially when it comes to Megumi.

Miki is the only person who knows Megumi's secret: that Megumi was originally a boy who was transformed into a girl by a trickster genie after making a wish. The two have been searching for the magical book that could reverse the spell ever since the transformation occurred six years before the main story. Yet, over time, Miki develops mixed feelings about finding the book. While she helps Megumi look for it, she secretly does not want Megumi to turn back into a boy. Miki has grown to appreciate and even prefer the feminine Megumi, and she goes out of her way to encourage Megumi to embrace a more traditionally girlish appearance and demeanor. She is protective of Megumi's new identity and will become assertive when she feels Megumi is acting too masculine or reckless. For example, she once threatened to end their friendship if Megumi cut her hair short.

Miki's role in the story is that of the grounding influence. She often acts as the voice of reason, reining in Megumi's more impulsive or violent tendencies. Their dynamic is a classic contrast of fire and ice: Megumi is hot-headed and physically confrontational, while Miki is calm, logical, and cautious. This balanced relationship makes them an effective pair in both comedic and dramatic situations. Miki is also a key emotional anchor for Megumi, providing unwavering support even when the rest of the world misunderstands her.

Throughout the series, Miki shows subtle development. She becomes more confident and assertive as she fights to protect her friend and their bond. Her loyalty never wavers, and she learns to stand up not only for Megumi but also for her own feelings and desires. Notable abilities include her sharp intellect and perceptiveness; she is quick to analyze situations and often devises plans to help Megumi or their group of friends out of trouble. Though not a fighter like Megumi, Miki's strength lies in her emotional intelligence, her steady presence, and her ability to influence others through calm reasoning. Her quiet courage and devotion define her as an indispensable companion in Megumi's strange new life.