Cumbling Michael
A professional beggar, Cumbling Michael is also one of Lord Vetinari's snitches, snouts and stool pigeons. He was raised to a Grade two Mutterer because he managed to finally catch a non-infectious but horrible skin disease.
Cumbling Michael, in Men at Arms, opens the door of the Beggars' Guild when Carrot knocks.
During the events of Jingo Lord Rust, who was temporarily Patrician over the course of the war, also uses him as an informant.