Hildegard "Hildy" Gloom is a witch and the main antagonist of The 7D who works to take over Jollywood alongside her husband and minion Grim.
Hildy is spoiled and often demeaning towards everyone. She says "I want it! I want it! I want it!" whenever she sees something exciting. Knowing Grim's inability to execute evil plans carefully on his own, Hildy often does the planning. Because she's a witch (and one of Jollywood's threats), nobody wants to be friends with her (as shown in "Surprise"). She also bosses Grim around; nevertheless, she loves her husband so much that they usually make kissy noises. Her pure undiluted love for Grim is her only positive quality. Hildy is envious of Snazzy Shazam, her longtime rival who usually bests her. She is also the first-born of her parents the Duke and Duchess of Drear, as revealed in "Bummer Vacation". He also can sing very well; she was taught by her father, the Duke of Drear, who is a musician. In real life, Kelly Osbourne and her father Ozzy Osbourne, who also voiced the duke, are also singers.
Hildy's frustrations with Grim putting a damper on their quest to conquer Jollywood became the focus in "Grim the Genius". After Grim destroyed their home after redirecting a lightning cloud meant for Queen Delightful's castle, he tries to win her back by becoming smart and finally forces Queen Delightful of her castle, making Hildy queen. Initially, Hildy is impressed by Grim's romantic actions. But Grim's intelligence really takes over his personality and he crowned himself king, and he starts to reject Hildy's affections. A heartbroken Hildy misses the old Grim and after losing the Smarty Pants Stone, he reverted to his old simple self. The two embrace, and Hildy says he doesn't need the stone and accepts Grim for who he is, showing that she truly loves him, leading to a mushy, but genuine nuzzling session.
Hildy's biggest weakness is that she freaks out at the sight of slimy things. Even though she loves Grim, she refuses to kiss her husband to make him human because he was turned into a frog once in "For the Love of Cheese". There are a few times the Glooms were forced to retreat due to something icky.
Despite Hildy's evil intentions, it's shown in "Hildy the Good" and at the end of "Jollybells" that Hildy can feel a sense of good within her. However, in both occasions, she quickly brushes it off.