Dianne was an NCR soldier and part of the NCR 5th Engineering Company before working for Otto. After the debacle at Burham Springs where a bunch of things blew up and released fiery gas, Dianne was assigned to be Otto's assistant. She is a young, attractive woman in her late twenties, and she is eager to learn all she can about engineering from Otto. She is also very well organized, which is a huge Benefit to Otto since he is somewhat of a slob. The two work well together, and should Otto decide to adventure with the player for a while, Dianne will take over as chief engineer in Downtown.
Dianne has not appeared nor is she mentioned in any published game. She was to appear only in Van Buren, the canceled Fallout 3 by Black Isle Studios. It is not certain if she will appear in any future Fallout game.