Lieutenant Sulu was the chief helmsman of the U.S.S. Enterprise in the TV show Star Trek. An Asian, he was part of a diversified cast, and along with Chekov and Uhura, he was one of the secondary characters. As such, his character wasn't as developed as Captain Kirk, Spock, or Dr. McCoy, although his character is frequently shown as having a wide variety of outside hobbies, including fencing, botany, and firearms. One of his more prominent roles was actually as the evil Sulu in the counter universe episode, Mirror, Mirror, in which his character attempted to assassinate Kirk and Spock, which would have left him in command of the Enterprise.
By the time of the movie Star Trek VI: The Undiscovered Country, Sulu had been promoted to captain and was in command of the USS Excelsior. He appeared in this capacity in an episode of Star Trek: Voyager (via flashback).
He had one daughter, who also joined Starfleet.