Narvi is a Dwarf who lives in the subterranean kingdom of Khazad-dûm in its heyday. This is the massive underground dwelling of Moria that the Fellowship of the Ring passes through on their way to Mount Doom. However, by the time Frodo and company arrive on the premises, the area is infested with Orcs — and a latent Balrog, to boot — with nary a Dwarf in sight. That’s why it’s called Moria, which means “the Black Pit.”
The events of “The Lord of the Rings” happen in the Third Age. In contrast, “The Rings of Power” takes place thousands of years earlier, in the Second Age. At that point, Moria is called Khazad-dûm, and it is a bright and vibrant city that sprawls for miles underneath the eastern and western sides of the Misty Mountains. We’ve already seen significant portions of that very-much-alive underground urban center in Season 1 of the show, although the only real characters we meet within it are King Durin III (Peter Mullan), Prince Durin IV (Owain Arthur), and Princess Disa (Sophia Nomvete).
Narvi is another member of that Dwarven community, and while he isn’t described as royalty like the others, he’s famous all the same. The index of the book “Unfinished Tales” describes Narvi as a “Dwarf of Khazad-dûm, maker of the West-gate, close friend of Celebrimbor of Eregion.”