Who is Nobby Nobbs from Men at Arms: A Novel of Discworld and what is their importance?

Nobby Nobbs is the second, longest-serving member of the Night Watch. He is described as being 'disqualified from the human race for shoving', a description that aptly sums up his semi-criminal attitude towards life. Nobbs is a small man with few endearing features. Once a street urchin, he realized that a job in the watch would allow him a comfortable bed and food, and an opportunity to meet girls.