Tandi, born in 2145, was one of the most important people of the West Coast in the 23rd century. She was the daughter of Aradesh and from her early years displayed uncommon strength of character and liveliness, complimenting her good looks (six feet tall with raven black hair and dark complexion). At the age of sixteen, in 2161, she met the Vault Dweller, a figure that'd inspire her for years to come with their charisma and skill, exemplified by ridding Shady Sands of the radscorpion plague. The impression was only reinforced when Tandi was kidnapped by the Khans during their raid and the Vault Dweller came to her rescue.
Inspired, Tandi helped her father expand Shady Sands, laying the foundations for the New California Republic. When her father died, searching for Vault 13, she took over and soon, the town grew substantially, as she opened trade routes with Junktown and the Hub, something her father was loathe to do, despite the obvious advantages. With a strong economy, her town soon dominated brahmin trade and eventually, the first NCR states emerged, slowly merging into one political entity, with help from the Brotherhood of Steel, which remained out of the power structure for the time being.
Tandi was declared the first President of the Republic and ever since has ruled the NCR with the Congress. She was focused on expanding the state, to bring peace and stability to the wastes. Her ideals long since replaced by pragmatism, she was not below forging a deal with New Reno to bully Vault City into joining the NCR and supplying it with their superior medical technology. Nearing 100 years of age in 2241, Tandi remained acting President, still retaining her wit and youthful fire, dementia and other ailments of the elderly seemingly failing to sink their hooks in her.
She had a son, Hoss, although she wasn't particularly proud of him.
- Tandi will remain in the Vault Dweller's party after being rescued until she is returned to Shady Sands. By avoiding Shady Sands after rescuing her, Tandi can serve as a 5th NPC party member alongside Dogmeat, Ian, Tycho, and Katja. However, Tandi is not really intended for use as a NPC companion, and she cannot be given any form of combat commands or orders (not even "wait here"). Her inventory also cannot be manipulated (other than by pickpocketing), and she will wield the first weapon she draws for the rest of the game (thus, for best results you should use pickpocket to remove her knife and give her a 14mm pistol as soon as she joins you).
- An inflatable rubber sex doll named Tandi can be found in New Reno; another can be found in the building behind Sheriff Marcus in Broken Hills, and such a doll is one of three items Typhon, son of Set, requires before revealing a treasure location.