Lackjaw

Lackjaw was a dwarf jeweller working in a small, unnamed city relatively close to Ankh-Morpork during the events of The Light Fantastic.

As a Dwarf, when the Red Star appeared, he drew the ire of the Star People, who, in addition to their burning of books and killing of wizards, wanted to kill all the "magical" (i.e. non-human) races. Lackjaw helped Cohen the Barbarian twice- first, by making dentures for him out of troll teeth, and second, by helping him frighten off the Star People with his large and dirty axe (guaranteed to add tetanus to the terrors of warfare).

Lackjaw and Cohen then attempted to flee the city, but were cornered by the Star People just as the Luggage appeared. The two of them then rode the Luggage in pursuit of Twoflower, Rincewind, and Bethan- the Luggage, hellbent on finding its master, didn't seem to mind. What happened to the dwarf after that is unknown; he didn't accompany Cohen to the University. Presumably, once things got back to normal he returned home. Or perhaps he has been absorbed into the great melting-pot that is Ankh-Morpork.