Chizuru Honda, often called Chizu by those who know her, is a quiet and inwardly intense girl who becomes one of the fifteen pilots of the giant robot Zearth. She tends to maintain a calm and aloof demeanor, but this surface tranquility masks a deep-seated disgust and mistrust for the people around her, particularly her male classmates, whose shallow and one-track minds she finds contemptible. This cynicism stems from a profound belief that excessive kindness only makes a person vulnerable to exploitation by evil people, a philosophy forged from her own traumatic experiences.

Her background is marked by immense suffering and betrayal at the hands of an authority figure. Chizuru was deceived and sexually abused by her teacher, a man she initially believed she loved. The details of this abuse differ significantly between the original manga and the anime adaptation. In the more graphic version presented in the manga, the teacher lured her into a date and then blackmailed her, subjecting her to gang rape by his acquaintances, which resulted in her becoming pregnant. In the anime, the teacher instead distributed compromising photographs of her online. Regardless of the version, this trauma fundamentally shapes her worldview. She becomes an intensely private person, refusing to confide in anyone, including her older sister whom she idolizes, and she begins carrying a knife with her at all times as a form of self-protection.

Chizuru's primary motivation becomes one of bitter and desperate vengeance. Resigned to her own impending death as a pilot, she plans to use her turn controlling Zearth not just to defeat the enemy robot, but to enact a bloody revenge on all the men who assaulted her, with her teacher being her ultimate target. Her role in the story is defined by this tragic convergence of her duties as a pilot and her personal vendetta. Before her own battle, she kills her fellow pilot Isao Kako. In the manga, she slits his throat to stop him from beating another child, while in the anime, he dies in an accident after attempting to assault her. When she finally pilots Zearth, she uses its colossal power to kill nearly all of her abusers, causing massive collateral damage and numerous civilian deaths in the process. However, she is stopped from killing her teacher by her older sister, who is revealed to be in love with him. After the battle, just before she dies from the contract with Zearth, she laments that her unborn baby will die with her, asking that their bodies be placed within the robot.

Her key relationships are few and largely defined by her trauma. Her bond with her older sister is one of admiration, yet poisoned by her sister's romantic connection to her abuser. Her relationship with Isao Kako is volatile; he harbors a deep, possessive crush on her, and in both continuities, his death is a direct result of his actions towards her. She shares a more nuanced and observant connection with Kunihiko Moji. While not close, she recognizes a similar detached and analytical intelligence in him, implying a quiet respect for his ability to see the world without the emotional blinders that affect others. Her development is grimly static; she does not find peace or redemption but rather a grim sense of purpose in using her final moments for revenge, ultimately succumbing to her fate with a resigned and sorrowful focus on the child she carries. Her only notable ability as a pilot is her raw, unfiltered will, channeling her despair and rage as a weapon more devastating than the enemy itself.