Cheimin Noah is the daughter of Bright Noah and Mirai Yashima Noah, making her the younger sister of Hathaway Noah. She is a young girl with black hair who physically resembles her mother. Her role in the story of Char's Counterattack is primarily as a civilian family member connected to the key personnel of the Earth Federation forces. While her brother Hathaway becomes a stowaway aboard the Londo Bell warship Ra Cailum, Cheimin remains in the civilian sphere with her mother. She appears alongside her family during the early stages of the Second Neo Zeon War as they attempt to travel to space; a politician named Adenauer Paraya commandeers three seats on a shuttle but allows Hathaway to board as a favor, leaving Mirai and Cheimin behind.

Cheimin's background includes being referenced during the earlier Gryps Conflict, as depicted in Mobile Suit Gundam Zeta, when the Titans kidnapped Bright Noah's family, including Mirai, the infant Hathaway, and Cheimin, to pressure the AEUG. She shows a curiosity about mobile suits, having demonstrated an interest in Kamille Bidan's Gundam Mk-II, which suggests she may take after her father's affinity for mechanical craft more than her resemblance to her mother might imply. Her motivations are not explored in depth within the film, as she functions primarily as part of the backdrop of Hathaway's family life, helping to frame her brother's personal stakes during the conflict. Her personality is not extensively developed on screen, but she is presented as a normal young girl caught in the circumstances of war due to her father's position. She does not pilot a mobile suit or participate in combat, and she has no notable abilities that affect the plot. Her key relationships are with her parents and her brother, and her presence underscores the personal cost and familial dimension of the ongoing conflict between the Earth Federation and Neo Zeon.

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