Grobnar Gnomehands is a gnomish bard who is one of the companions in the campaign. You encounter him early on in the game where the player runs into him at a camp. He is portrayed as possibly insane, and generally acts as comic relief for the story. He is obsessed with locating some mythical beings named the 'Wendersnaven' who are entirely undetectable. Late in the game he gets an item called the 'Wenderkazoo', which is apparently an equally invisible kazoo. This instrument is quite powerful game wise, but it is commented that while he hears it as a beautiful melody to everyone else it just looks and sounds like him humming under his breath. He is also the one who rebuilds the Construct if enough parts are found.
He is confirmed to have died in the destruction of the King of Shadow's lair in Mask of the Betrayer, having sacrificed himself to save the Construct.
Source: Wikipedia, "List of Neverwinter Nights characters", available under the CC-BY-SA License.