Dawn Bellwether

Dawn Bellwether is the main antagonist of both Three's Company and Sisters are Worth the Trouble.

Official Biography
"Bellwether, a sweet sheep with a little voice and a lot of wool, who constantly finds herself under foot of the larger-than-life Mayor Lionheart."

Personality
In the beginning of the fan-fiction (and the film), Bellwether appears meek, shy, and friendly. In fact, she was friends with Amelia Bluebell and one of the few people who calls Emma by her real name. However, she does feel over-worked and sympathized with Judith "Judy" Hopps and Amelia "Emma" Bluebell, clarifying both of them were under-appreciated and underestimated. Bellwether also found potential friendships with Judy and Emma.

However, underneath her caring and kind demeanor, Bellwether is cold, cruel and manipulative. She doesn't seem to care that all the predators in Zootopia are attacking prey. The true motive of her poisoning all the predators was because she believed that the prey should dominate the predators.

Despite claiming that what she's doing is for prey's cause, she doesn't really care what happens to her victims after they are mauled by the savage animal. Her overconfidence became her downfall, as Judy had recorded her confession without Bellwether's knowledge.

Three's Company
In the first one, her goal is to turn prey against predator.

Sisters are Worth the Trouble
Bellwether escapes prison and kidnaps Judy, Nick and Emma behind the scenes, hoping that Judy's Emma's and Nick's younger sisters would fight a lot and never save them in revenge. However, the sisters manage to find them and Bellwether is incarcerated once again.

Trivia

 * Her character and mannerisms are reflected on by Maria Bamford and Tina Fey. She also appears to be based on the Sheep from Lambert the Sheepish Lion and the sheep from Fun and Fancy Free and Melody Time
 * Judy, Emma and Nick recording Bellwether's statement of being the mastermind behind all the animals' attacks reflects on Mike Wazowski recorded Mr. Waternoose's confession. Additionally, both Judy and Mike replay the recording on them.