Heck, the Ghoul School girls get a Crowning Moment of Awesome simply for being nice enough girls that Shaggy and Scooby are willing to hang around monsters for an entire school year without screaming their heads off.
Revolta is completely neutralized as a threat in two moves, and it's thanks to Tanis and Elsa. Tanis uses her bandages as a "lasso" to take Revolta's magic wand away from her, and Elsa then throws the wand into the fire, destroying it.
Tanis: I want that wand!
Sibella was the only ghoul who almost got away from from the spiderbats, and she was strong enough to nearly manage to shake off the hypnosis—even Revolta notices it.