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.

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.

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.