A run down of the Factions
The New California Republic or NCR is a faction dedicated to restoring order and progress to the wasteland, as well as old world values such as democracy, liberty, and the rule of law. As of early 2240, the population was about 700,000 people. In terms of political influence, economical power and population, the NCR is arguably the largest and most powerful known power group in the world of Fallout, and it maintains the largest standing army.
A slaving organization, led by the charismatic and cunning Caesar. The legionnaires are a well-organized fighting force that mainly operate east of the Grand Canyon and in Arizona. The Legion is comprised mostly of reconditioned tribals and their young offspring.
Master of the city of New Vegas, House foresaw the nuclear war and steps to keep himself alive via a sophisticated life support machine, he now rules New Vegas with an army of Securitrons.
A new incarnation of the Khans raider gang, based in Red Rock Canyon, hey usually travel in small scouting bands, but sometimes they roam as full war parties. The Khans, above all else, respect physical strength. They are eager in combat to prove their worthiness to the clan by engaging in hand to hand combat with fists or clubs. They prefer melee weapons over ranged weapons, although higher-ups carry a few small arms.
Followers of the Apocalypse
A semi-religious group who appear to be all that remain of Christianity even though this isn\'t at all their main focus. They are dedicated to reeducating and rebuilding the wasteland and to ensuring that humanity does not repeat the mistakes that led to the Great War.
Brotherhood of Steel
A techno-religious organization, with roots in the American military and government-sponsored scientific community from before the Great War. The Brotherhood is mostly composed of the descendants of those military officers, soldiers, and scientists, but aside from some outsiders among their ranks.