She wore a violet robe underneath a pink scarf, and had white hair.
Powers and abilities
Many people believed she used her witchcraft to cast spells on the villagers, turning them into frogs, and that's how she scared them away.
She also appeared to have the ability to transform into a black cat, but it turned out to be Aggie's own strategically placed cat. Shaggy tried to beat her at her own game by dropping a frog costume on her. When she saw herself in the mirror, she was both shocked and impressed that she somehow turned herself into a frog, albeit a gigantic talking one.
The Scooby-Doo Show
She made up the Ozark witch, McCoy, to scare the Hattfields away from their cabin, because her old boyfriend, Zeke Harkins, deposited a map to his hidden loot in the cabin.