To get the bio text when you select the character in-game, you have to add this line to the bottom of the XPlayers.int file in your UT2003\System folder.
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AssassinBio="Name: Assassin|Age: Unknown|Height: 187m|Race: Human||Data:|Nobody really know where he came from besides of his country: Germany. He is the greatest Problem of the other UT2003 Warriors, because he is cold blooded when he set foot in the arena. If you can trust his words he is fighting in the Tournament to avenge his friend. The Killer of his friend is someone who is fighting in the higher classes of the UT2003 Championship||"