Glingleglingleglingle Fairy
Called into being by the disturbance caused when Teatime temporarily inhumed The Hogfather, the Glingleglingleglingle Fairy existed to ring a set of fairy bells that went, well, "glingleglingleglingle" whenever other new entities were called into being by the disturbance. He was, almost paradoxically, called into existence with a "glingleglingleglingle." He claims he also can do some special effects that go ping.
Archchancellor Ridcully gave him what for during the events of Hogfather.