Trixie

Trixie is one of the toys owned by Bonnie, who appears in Toy Story 3. Trixie is a plastic Triceratops toy and is part of the same toyline as Rex. She is voiced by Kristen Schaal.

In the film, she is next to Woody while he uses Bonnie's mother's computer. Trixie had been instant-messaging someone named Velocistar237, who left a message saying, "U there? I made it 2 the Dark Fortress!!". When Woody asks about this, she quickly exits it out saying that it was just a dinosaur down the street and it was nothing important.

In the end credits, Trixie becomes close friends with Rex after the latter is donated to Bonnie by Andy. During the credits, the two dinosaur toys are seen playing a video game on a computer in one scene. They are also seen side by side as the toys enjoy watching Buzz and Jessie perform a paso doble.

Toy Description
From Official Website:

"Trixie is a perfect playmate for prehistoric playtime! Visit the era when dinosaurs ruled the Earth! Made of rigid, durable plastic and in friendly shades of blue and purple, Trixie features an expressive mouth and movable legs. This gentle Triceratops will feed any child's imagination. Also available: Tyrannosaurus Rex, Stegosaurus, and Velociraptor."

Trivia

 * Trixie's character may have been hinted (though not yet planned) at the end of the original Toy Story, because of Rex hoping that Andy will get another dinosaur toy "like a leaf eater" so he could play the dominant predator.
 * Trixie enjoys video games just as much as Rex does. An example is the IM she gets on the computer.
 * She appears in Toy Story 3: The Video Game as an announcer in the Skate Park.
 * Trixie, along with Rex, appears in the Dino Darts part of the Disney World attraction Toy Story Midway Mania!.