Willow

 is a ghoul, the self-proclaimed sentry of the Underworld. She can usually be found on the Mall, wandering around just outside the entrance to the Museum of History. She seems unconcerned with standing around a heavy combat zone, claiming that the Super Mutants don't attack her, as they seem to consider Ghouls to be kindred.

 wields a Laser Rifle, and wears Merc Armor. She's somewhat tougher than the average Wasteland citizen or Raider, being slightly above a standard Super Mutant in terms of durability.

Trivia
The character is possibly a reference to Alyson Hannigan's character "Willow Rosenberg" in the TV series Buffy the Vampire Slayer. Both characters are redheads. Well, as much as a ghoul keeps any of their hair.

Appearances
 only appears in Fallout 3.