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.

''Glitch: 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.(requires confirmation)''

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

Apperances
 only appears in Fallout 3.

Easter Egg
 is based on character Sydney Fox from the TV show Relic hunter.