Bottle is one half of Nuka-World mascots, Bottle & Cappy. N.I.R.A. is a modified Protectron in the image of Bottle. He can also be seen in various Nuka-World advertisements, and in The Grand Tour sub quests icons.
Cappy and Bottle are kidnapped by a raider gang in the quest series "Nabbed from Nuka-World". After freeing them, the pair will appear in the vault sporadically. They provide a temporary 20% happiness increase to every dweller, regardless of which room they are in. After they leave, dweller happiness is returned to their previous level. Tapping on Bottle while he is waving or dancing will produce bottle caps or up to five bottles of Nuka-Cola Quantum.
Statue in Nuka-Town USA
Bottle and Cappy
Bottle & Cappy's reward icon in Fallout Shelter
Bottle awarding Nuka-Cola Quantum when clicked in Fallout Shelter
Bottle and Cappy from the Fallout 76 teaser trailer