The Time Traveler is a hidden occult life state featured in The Sims 3: Into the Future. Only one pre-made Time Traveler exists, NPC Emit Relevart. A sim cannot become a Time Traveler without the use of mods.
This life state only exists in the game for technical purposes. If a sim has this life state, the sim will automatically change to Time Traveler's outfit permanently, as the life state removes the ability to change outfits. It also blocks the use of romantic interactions in any way possible.
Playing with this life state is not advised, as it can break an ongoing game.