The Triceratops is a male (?) dinosaur that appears in the episodes The Dinosaur Problem, The Power of Zero, and The Imaginary Friend Problem.
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Triceratops is a light blue colored Triceratops with three light purple spots on his back and three white horns (like most Triceratopses). He has four stumpy feet with white toes on each foot.
The Triceratops seems calm and sort of go-with-the-flow, but you don't actually know that much about his personality anyway.
The episode starts by Peg dramatically saying, "When dinosaurs walked the earth...
Then the camera zooms out to reveal Triceratops, Stegosaurus, and Brachiosaurus standing around her and Cat. They are in Dinosaur Valley. Peg explains Stegosaurus's seven plates, and then explains Triceratops' three horns by drawing him with her stick and pointing out the three horns. Triceratops says "Horn horn horn." Then Peg explains Brachiosaurus's tail.
Peg suggests that they go see the view from a ridge way up high. The five of them start walking and soon come upon a muddy trail. Peg comments that dinosaurs love making patterns, and questions what kind of pattern they need to make. They decide on "step step, bounce." Peg rides on Brachiosaurus's head and Cat clings to Brachiosaurus's long tail. Peg then sings about "step step, bounce," and the Triceratops says, "horn horn, horn," to the beat of Peg's song.
They finally arrive at the top of the muddy trail, and Peg notices that Cat is all muddy from splashing into the muddy trail when Brachiosaurus moved his tail up and down. She says that Cat will feel better when he sees the view, and presents it to the dinosaurs and Cat. The dinosaurs gasp -- because there is a huge "boulder" blocking the view. Cat says that he feels mostly the same. Peg realizes that there is a "boulder" in the way and announces that this is a "big problem!" Triceratops comes up to try to move it, but he can't. Stegosaurus comes up to help, but they can't move it together either. Then Brachiosaurus joins in, but even the three together can't move it. Then Cat goes to sit on Brachiosaurus's tail, and the boulder finally rolls out of the way. Then Peg and Cat sing their "problem solved" song.