Sydney

 is a relic hunter the player will meet when hunting for the Declaration of Independence. If she survives the quest and gets to Rivet City, she will retire from relic hunting and become an ammunition vendor in Underworld. If you get into a fight in the Underworld, Sydney will fight alongside you.

Sydney can also be found dead in Anacostia Station, apparently killed by Raiders. It is not known if this is a bug.

In the Statesman Hotel (rescuing Reilly's Rangers) you'll find a Holotape from her Father. Show her this Tape and she gives you her SMG and a supply of ammo.

Known Weapons
Sydney's 10mm "Ultra" SMG (unique SMG, 35 DAM initially, 50 DAM at 100% CND)

Apperances
only appears in Fallout 3.

Behind the scenes
is based on character Sydney Fox from the TV show Relic hunter.

Glitch / Exploit

 * It is confirmed that If you do not talk to Sydney prior to finding declaration she will disappear from the hall. You will still get the mission to fend off mutants if you approach her position (The Super Mutants will spawn.) She won't be at Rivet City/Underground or somewhere else after that.


 * You can use her as a joinable character, if you get her and don't complete the quest of course.

Exploit

 * If you wish to keep her as an extra NPC you can do so easily. She will stay with you as long as you do not complete the "Stealing Independence" Quest. So do not return to Abraham Washington. A few drawbacks with her as an NPC. She cannot be equipped with any new weapons or armor, she cannot be given any items to hold, she can die permanently, she cannot be told to wait somewhere or change tactics, she has to be manually healed with your stimpacks and she has the health of an average human raider and can be downed quite easily. Overall a decent fighter and good extra NPC to have.