MARGOT

Margot is apparently the only friendly NPC encountered in the Presidential Metro Line.

Below is a quote from a recent article.

"With the giant artillery in hand, players will make their way through an old White House service tunnel--now occupied only by the computer character Margot--toward the Adams Air Force Base, an apparent hub of Enclave activity. "

Another recent article clarifies that Margot is actually a computer NPC, meaning some form of previously forgotten A.I. running beneath the ruins of the White House. A quote from the article below.

" To get to the base, you'll first need to navigate the forgotten Presidential Metro Line running under the nuked remains of the White House. It was the venue for a pitched battle between Sentry Bot (Fallout 3) and armies of ghouls when I dropped in to visit. Watched over by a mysterious computer system named Margot, a ride through such shadowy confines is a tempting notion, and another claustrophobia-inducing chunk of intrigue from a game that uses its world famous setting to endlessly good effect."