Kurisu

Kurisu is a character which was to appear in the Van Buren project. However, she was first mentioned in Fallout 2. She was the sister of Sulik, a joinable NPC from Fallout 2. She was a young tribal girl kidnapped by slavers. Although Sulik's quest was to find her, and she was initially meant to be found in the game, this quest was eventually unfinished. She was not given any name in Fallout 2.

In Van Buren, she was to be a "mad goddess", a group of fanatics who worshiped her life/death religion. Mad the goddess may be, but the genetic knowledge she turned into a religion was helping the wasteland. The player could take her down and free the people from her tyranny (and possibly weaken them in the long run) or let her religion prosper (and build a heartier stock of people that could better survive the rigors of the wasteland).

It is not yet known if any of this story will appear or be referenced in the upcoming Fallout 3 by Bethesda.