Yu Hayakawa Yu Hayakawa is one of the main characters in " " . 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 " . Story . 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 . Musical theme . Yu has his own theme , " Yu ' s Theme " . It evokes Yu ' s kind but naive personality . Composed by Shirō Hamaguchi , it is the fourth track in " " . Etymology . It also evokes the English " you " , matching with his twin Ai ( " I " ) .