Ben Canning

A man found inside a gorge in the far north/center of the map, sitting and begging for water. However, unlike the water-beggars found outside some towns, he only seems to take one bottle. After being given one, he proceeds to drink it repeatedly; when activated, he apologetically tells the character that he's not up to traveling yet. Standing after a minute or two, he simply says "Good to see you again, friend!"

Afterwards I found him outside of Megaton, loitering.