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Yu Hayakawa is one of the main characters in Final Fantasy: Unlimited. At twelve years of age their parents, the geologists Joe Hayakawa and Marie Hayakawa, left their island home of Sadoshima in Japan for their second trip to Wonderland. He is one of a set of twins, with his sister Ai Hayakawa being the second of the set.
He is the more impulsive of the pair, and the more trusting, as seen in his attempts to befriend Kaze. Early in the series he finds a hair clip with a chocobo feather in it, and by wearing this he can feel the emotions and desires of chocobos he encounters.
His name is written in Roman letters in an episode as "Yuh".
Twelve years before the main setting of Final Fantasy Unlimited, he and Ai were a part of Chaos, but split from the main body for unknown reasons. When the twins where found by the couple Joe and Marie Hayakawa, who had recently lost an unborn child, they were still in the form of babies, and were thus taken in by the couple.
Most of the twin's childhood is left unexplained, suggesting that they group up as normal children without knowing their origins in Wonderland. After his parents left from Wonderland for the second time, Yu took charge of most of the household tasks, such as cleaning. It was some time after that Ai convinced him to follow their parents into Wonderland with her.
Soon after boarding the train to Wonderland, he and his sister discovered Lisa following them, and though Ai was initially distrustful, Yu attempted to befriend her immediately. After arriving at their first destination, Yu discover Kaze while chasing a chocobo.
Though he is initially shocked by Kaze's strength, he attempts to befriend him, even leading them aboard the train with them just before it departs while Kaze is in a daze from his memories. While at their first stop, Yu discovers a chocobo, which he later names Chobi, and a hair clip that allows him to feel the emotions of chocobos. Using his new found power, and his love of animals, and befriends Chobi who then accompanies him for the majority of their journey. It is rare to see the pair separate after this encounter.
After traveling with Lisa and his sister for some time, and eventually helping to crew Jane the submarine, he is separated from the rest and winds up inside Earl Tyrant's fortress Gaudium. It is here that he discovers the fate of his parents; they are being controlled by Herba, one of Earl Tyrant's lords.
After escaping with the help of Chobi, Yu become sullen and silent, not understanding the nature of his parents' imprisonment, simply believing that they have forgotten about their son, and serve Earl Tyrant of their own free will.
Not long after he, his sister, Kaze, Makenshi and Lisa are all captured by Earl Tyrant, and their nature as part of Chaos is revealed. After they shake off their initial despair when the twins learn of the truth behind their parent's capture, they call out to Kaze, allowing him to destroy Chaos with the Magun.
Yu has his own theme, "Yu's Theme" (ユウのテーマ, Yuu no Tēma?). It evokes Yu's kind but naive personality. Composed by Shirō Hamaguchi, it is the fourth track in Final Fantasy: Unlimited - Music Adventure Verse 1.
Yū is Japanese for courage. It also evokes the English "you", matching with his twin Ai ("I").