Eris (The Grim Adventures of Billy & Mandy)

Counterparts

 * Maggie Simpson (The Simpsons)
 * Princess Morbucks (The Powerpuff Girls)
 * Vicky (The Fairly OddParents)
 * The Evil Queen (Shrek)
 * Madame Gasket (Robots)
 * Duchess (Foster's Home for Imaginary Friends)