Willow

 is a ghoul, the self-proclaimed sentry of the Underworld. She persistently addresses the Lone Wanderer as a "tourist". 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 ignore Ghouls in general.

She's somewhat tougher than the average Wasteland citizen or Raider, being slightly above a standard Super Mutant in terms of durability.

She commonly refers to the BoS as "...other ass-holes".

Appearances
Willow only appears in Fallout 3.