Age: No-one really knows!
Best friend: Dennis
Prized possession: His teeth
Motto: "I gnash therefore I am"
Super skill: His amazing super-strong teeth
Family: His son, Gnipper, and his daughters Gnaomi, Gnatasha, Gnanette, Gnorah and Gnancy
Address: 51 Gasworks RoadFact: Gnasher is a super-rare Abyssinian Wire-haired Tripehound, and his teeth are the strongest things known to science (probably)