Grimm and his Troupe used to travel from the Nightmare Realm to wherever the Nightmare Lantern has been lit by acolytes, but now he has chosen to settle down, along with his troupe, in Dirtmouth, a mostly deserted town. 

Grimm is a Posh, yet kind being. Grimmchild is Grimm's off spring, who is now a teen, who's learning how to harness the power of the Nightmare Heart with his father's teachings.

The only others in The Troupe are Brumm the accordion player and Divine who repairs fragile charms.