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Grimwold "Grim" Gloom is a warlock and the secondary antagonist of The 7D who works to take over Jollywood alongside his bossy wife Hildy. In "The Jollywood Jam" it's revealed that his great-great-great grandfather once ruled the kingdom. His musical motif is "The Grim and Hildy Theme" (shared with Hildy).
Grim is being portrayed in the show by not being bright in many situations, and that usually lead to many of his and Hildy's failures. Despite the fact that Hildy bosses him around he, in his heart, loves her and will do anything for her and Hildy wholeheartedly returns his feelings. In his spotlight episode "Grim the Genius", Grim attempts to become smart while trying to win back Hildy after another failed attempt to drive Queen Delightful out of her castle (and destroying their manor at the same time). He (donning a disguise) obtains the Smarty Pants Stone from Doc and Grim becomes intelligent. He then patched things up with Hildy after they together seized Delightful's throne, making Hildy queen. However, Grim's new-found smartness rejects Hildy's affections. After The 7D got back the Smarty Pants Stone from Grim, he realizes that he doesn't need it now that Hildy misses the old Grim and the two embrace (and being sent to the moon by Grumpy).
Grim's warm and childish nature is in stark contrast to his evil great-great-great-grandfather, who ruled Jollywood many a year ago.
In "Itsy Bitsy Spider Fighters", it's revealed that Grim is afraid of spiders (despite the fact he was transformed into a six-foot spider himself by Hildy) as well as ladybugs.
Grim's standard clothing consists of a gray trench coat with stars and a crescent on its left side and a black belt. Underneath the coat is a purple collared shirt and blue tie. Rounding out his outfit are black trousers and purple shoes. His hair is blue with a white lightning bolt and he has a large nose. Both he and Hildy have moles above their cheeks; Grim's on his right. As with Hildy, Grim retains some of his human characteristics when he transform into different forms.