A fascinating timeline of Hikaru Sulu and his family and the U.S.S. Excelsior and her crew including Janice Rand and Tuvok.
This looks like Sulu's character has more written history than any of the other Enterprise bridge crew.
http://www.ridgenet.net/~curtdan/Excelsior/Timeline.html (http://www.ridgenet.net/~curtdan/Excelsior/Timeline.html)