Mao is Sara's younger sister. Unlike her sister she is cheerful and outgoing, longing to see the outside world. Mao has a very obvious crush on Shin.  In the 2008 series Macross Frontier, a version of the Macross Zero story is reproduced as a movie, in which Mao Nome is played by the character Ranka Lee. Ranka's adoptive brother Ozma is also shown reacting on his sister playing "Doctor Mao" as something "bound by fate".  She is Sheryl Nome's grandmother and Sally Nome's mother.

Taking place one year before the Zentraedi arrive on Earth, Macross Zero chronicles the final days of the war between the U.N. Spacy and anti-U.N. factions. After being shot down by the anti-U.N.'s newest fighter plane, ace pilot Shin Kudo finds himself on the remote island of Mayan, where technology is almost non-existent. While Shin stays on the island to heal his wounds, the tranqulity of the island is shattered by a battle that involves the UN's newest fighter - the VF-0.
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(Source: Anime News Network)