Belladonna

Belladonna is Annabelle's evil yet beautiful cousin and a recurring villain of All Dogs Go To Heaven franchise films and is the main antagonist in the third film. She also appears in the TV series.

All Dogs Go To Heaven: The Series
She first appeared in the episode La Doggie Vita, where, upon her first appearance, Charlie mistakes her for Annabelle. She lies and says that she is Annabelle and is undercover. she sing a song called "Take the Easy Way Out"

An All Dogs Christmas Carol
She is the true main villain here.

Trivia

 * The name "Belladonna" is Italian for "Beautiful Lady" and is the name of a lethally poisonous plant.