Dawns, Noons, and Dusks
They are the lieutenants of the current owners of their respective Keys. There seem to be no special powers associated with these Denizens, although they tend to be taller and more powerful than most others. Each Trustee has or has had three of these servants, but Grim Tuesday split his into seven. They are limited to visiting the Secondary Realms only in their time period; i.e. Monday's Noon can only stay on Earth on Monday, between the hours of Noon and 1:00 p.m.. So far all Noons and Dusks have been male, and all Dawns have been female, save Friday's.
One of all the Dawns', Noons' and Dusks' attributes is that the Dawns all have golden tongues, the Noons have silver tongues, and the Dusks have black tongues. This trend implies that it was Saturday's Noon that attacked the Lieutenant Keeper in Sir Thursday.
Read more about this topic: List Of The Keys To The Kingdom Characters