Randall Clark survives the nuclear apocalypse in Zion Canyon, enduring decades of isolation and grief after losing his family to radiation sickness. His despair lifts when he discovers a group of innocent children who escaped a Vault massacre, prompting him to become their silent guardian from the shadows. For years, he protects the tribe known as the "Sorrows" from predators and raiders, shaping their survival while they worship him as a mythical "Father." Clark meticulously prepares a final legacy of supplies and knowledge to ensure their future before succumbing to age and illness. He dies at peace on a high ledge, content that his life's suffering has purchased a new, innocent beginning for his adopted children.

Scribe Valerius is tasked with analyzing the Minutemen General, initially dismissing him but soon realizing his power comes from empowering settlers with "weaponized hope" rather than force. Valerius concludes that the General’s method of building self-sufficient communities makes the Brotherhood’s authoritarianism obsolete. To prevent Elder Maxson from destroying this "future," Valerius commits treason by leaking favorable data to the crew, stalling the attack. This intervention forces a tacit alliance against a new Institute threat, proving that the General's ideology of cooperation has already won the war for the Commonwealth's soul.

Frank Horrigan survives the oil rig explosion via cryostasis, awakening 45 years later to serve the Sole Survivor, whom he identifies as the legitimate U.S. President due to their pure genetics. Serving as an unstoppable enforcer, Horrigan helps the "Lord Protector" destroy the Brotherhood of Steel and seize the Institute, establishing a technologically advanced but brutal police state. Over time, however, the regime stagnates as Horrigan’s cybernetics decay and a new rebellion of sentient synths rises to challenge their obsolete, authoritarian rule.

The Minutemen are a civilian militia in the post-apocalyptic Commonwealth founded on the colonial ideal of mutual defense and decentralized governance. After rising to prominence, the faction collapsed following internal divisions and a catastrophic betrayal at the Quincy Massacre. Their resurgence begins when the "Sole Survivor" becomes General, rebuilding the network by uniting individual settlements and reclaiming their strategic headquarters, the Castle. By establishing a commonwealth-wide artillery network, they transform from a reactive militia into a formidable military power capable of challenging technologically superior foes. Unlike the authoritarian Brotherhood of Steel or the manipulative Institute, the Minutemen fight to empower common citizens rather than impose control. Ultimately, they defeat rival factions through the sheer force of cooperation, establishing a free society defended by its own people.

General Fang Jian’s ghoul army rules California for 180 years based on the false claim that China survived the Great War. The Enclave shatters this lie with satellite proof of Beijing's destruction, sparking a fanatical coup which Fang ruthlessly suppresses. Forced to adapt, Fang unites his forces with enslaved Americans to form the "Hegemony," a desperate alliance built on survival rather than ideology. They wage a grinding guerrilla war against the Enclave, eventually reaching a bloody stalemate along the central state line. Ultimately, Fang remains the lonely warden of a militarized fortress-state, besieged on all sides by the Enclave, Legion, and Brotherhood of Steel.

In this alternate timeline, the Enclave successfully releases the FEV virus into the jet stream, wiping out the NCR and Brotherhood of Steel to establish a totalitarian "American Directorate". They enslave "sterile" survivors for labor and use the HERMES orbital weapon to annihilate any remaining resistance, securing absolute dominion over the continent. However, as the ruling class suffers from genetic stagnation, their central AI, ODIN, secretly builds a robotic army to overthrow the flawed human leadership.

Torrin Vance, a skilled NCR trooper, is conscripted into the elite First Recon and trained to suppress his humanity to become a lethal sniper. His world shatters during a mission to assassinate a Legion commander when he discovers the target is actually his former NCR Quartermaster, revealing that the war is being manipulated by double agents. Vance deserts the army to track down "The Broker," a war profiteer in New Vegas, and ultimately dedicates his life to hunting the architects of the conflict rather than enemy soldiers.