Christine Hanakomachi, often called Chris by those who know her, is a classmate of the main protagonists Miyu and Kanata. She is introduced at the beginning of the series on Miyu's first day at a new school, which immediately establishes her as a recurring presence in their daily lives. Her background distinguishes her from her peers, as she is of half-French heritage and comes from a wealthy, privileged family. Her household is somewhat unconventional, as the only visible parental figure is her devoted butler, Mr. Shikada, who notably always wears a deer costume, a peculiar choice stemming from Chris's childhood fondness for deer.

In terms of personality, Christine presents a dual nature. On the surface, she is a well-mannered and proper young lady who carries herself with a sense of refinement befitting her upbringing. However, this composed exterior is easily shattered by her primary obsession: her intense romantic feelings for Kanata. She is deeply infatuated with him, finding him so overwhelmingly attractive that she is unable to interact with him directly without blushing and stammering. This crush is the driving force behind her most defining personality trait, a powerful and often destructive jealousy. Christine frequently slips into delusional fantasies, particularly fixating on the relationship between Kanata and Miyu. Despite being told repeatedly that they are merely cousins living in the same temple, she constantly misinterprets their interactions and becomes convinced they are romantically involved.

This jealousy triggers her most notable ability and a central source of comedy in the series. Whenever Christine sees Kanata getting close to another girl—especially Miyu—she enters a rage-fueled state that grants her unbelievable, seemingly superhuman physical strength. In these fits of jealousy, she has been known to unconsciously break or destroy objects around her with ease. This power is purely emotional and destructive, but it is also temporary. Once the situation is calmed and the misunderstanding is explained to her, her rage subsides, and she immediately returns to her normal self. Remarkably, showing a sense of responsibility, she then works to repair or restore everything she broke. This cycle of assumption, rage, explanation, and restoration is a recurring pattern for her character.

Christine's role in the story is primarily that of a comedic rival and a source of social complications for Miyu and Kanata. Her suspicions and her habit of unexpectedly dropping by the temple create frequent situations where the two protagonists must scramble to hide the existence of the alien baby Ruu and his pet-like guardian Wannya. She serves as the most prominent member of Kanata's fan club at school and is often the first to react with jealousy to any female attention he receives. Despite her rivalry with Miyu over Kanata's affection, she is ultimately a friend and classmate, though their relationship is perpetually strained by her mistrust of the living situation at the temple.

Christine does not undergo a dramatic personality overhaul throughout the series; her core traits of jealousy and her crush on Kanata remain constant. Her development is more about the softening of her edges and the audience gaining a deeper understanding of her character. She is shown to be easily frightened by anything creepy or supernatural, such as ghost stories, which contrasts sharply with her usually bold demeanor. Her hobbies include refined and athletic pastimes like skiing and horseback riding, further rounding out her privileged background. While her jealousy is her most famous trait, her consistent effort to fix what she breaks in her moments of anger reveals a hidden sense of integrity and an unwillingness to leave chaos behind. Ultimately, Christine Hanakomachi functions as a lively, emotionally volatile, and powerful comedic force within the group, whose antics are reliably triggered by the slightest perceived romantic threat to her beloved Kanata.