The Hikaru Sulu reference article from the English Wikipedia on 24-Apr-2004
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Hikaru Sulu

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Hikaru Sulu is a minor character in the original Star Trek series, played by George Takei. He was originally staff physicist, but ended up being transferred to helm. He gets promoted to captain and gets his own ship in Star Trek VI. His daughter is Demora Sulu, who became helm officer of the Enterprise-B.

As with many of the minor characters, he is somewhat of an enigma—his first name wasn't even revealed until that last film. The character is meant to be of pan-Asian decent, but was raised in San Francisco. 'Hikaru' is a Japanese name, while 'Sulu' is taken from a province in the Philippines. In the Japanese version of Star Trek, his name is changed to 'Kato', at least partly because the Japanese language lacks the letter "L".