The Vault Dweller

The Vault Dweller was raised in Vault 13, and was not alive when the bombs fell during the Great War that devestated civilization. When his Vault's water chip broke, the Vault Dweller was the one chosen to go out into the cold, harsh wasteland to find a replacement and save his people before they died out. Along the way he was joine by Ian, Dogmeat, Tycho and Katja, and as they searched throughout the wasteland for the chip, they began to uncover a much bigger plot. The Master, a mutant abomination, had created the Forced Evolutionary Virus (FEV) and was using it to breed an army of mutants that could stand up to the harshness of the new world, intending to create a new world order so people could rise again. His creation, the Super Mutants, were monsters and for the most part, uneducated and barbaric. While the Vault Dweller agreed with the concept of making a new world for man, he fundamently disagreed with the Templar-like way the Master's armies destroyed all in their way to enforce this order, before hunting down the Master and confronting him. While it cost him the lives of his close friend, Ian, and resulted in the death of his beloved dog, Dogmeat, the Vault Dweller managed to overcome the forces of the Super Mutant army and blew the Master to hell. When the Vault Dweller finally came home with the water chip, he was a changed man, and the Vault's overseer knew he couldn't be allowed to return to the Vault after what he had seen, and tearfully banished their hero to walk the Wasteland. He eventually setteled down and had a daughter while founding the town of Arroyo. His Grandchild would later walk the wastes as "The Chosen One". He also was a major guiding light in the foundation of the New California Republic many years later, after rescuing it's future founder, Tandi, from Raiders.

Tycho
After the Vault Dweller helped him take down the massive crime boss Gizmo in Junktown, Tycho joined him on his quest. Dressed in modified SWAT Armor with a leather duster, and his face obscured by a gas mask, Tycho was a mysterious ally. When things came to blows, and they usually did around the Vault Dweller, Tycho was ready to plaster their enemies with his deadly shotgun, a weapon which ended the lives of many a Raider.

Dogmeat
One of the most loyal beasts in all the Wasteland, Dogmeat joined the Vault Dweller when he gave the dog food to help him grieve his recently killed master. The Dog was reminded of his fallen owner in him, and became his loyal companion. While he later met his end in the Mariposa Military Base, he managed to conceive a legacy that would help other Vault escapees throughout the Wasteland for years.