Dawn Bellwether

Dawn Bellwether is the assistant mayor of Zootopia and (SPOILER ALERT!) the hidden antagonist of the movie of the same name.

Trivia

 * Her voice actor Jenny Slate also appeared in the 3rd Chipmunks movie, Chipwrecked, as a neutral castaway named Zoey. She is also voicing a dog named Gidget in another 2016 animated feature, Illumination's The Secret Life of Pets.
 * When Bellwether begins her revenge streak on Barney's Adventures of Sing, it's revealed she has a beautiful voice.

Barney's Adventures

 * Barney Goes to Zootopia
 * Barney's Adventures of Sing