Willow

 is a ghoul, the self-proclaimed sentry of the Underworld in the year 2277.

Relationships
Has less than friendly views of The Brotherhood of Steel and Talon Company, referring to them as "assholes."

Interactions with the player character
She persistently addresses the Lone Wanderer as a "tourist".

Daily schedule
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.

Appearances
Willow only appears in Fallout 3.