Pierce (Dawn of the Dinosaurs)

Pierce is an adult male Kentrosaurus that appeared in Dawn of the Dinosaurs. At first he was sour, cranky, ill-tempered, cynical, wrathful, grouchy, sarcastic, grumpy, surly, angry, lonely, cold and stubborn, but at the end, he becomes kind, selfless, heroic, kind-hearted, brave and nice.

Meeting Rick, Brill and Hallo
Pierce embittered by his experiences, ignored the crowds of dinosaurs migrating south to escape the freezing cold brought on by the ice age as he walked right through them all, not caring that he was nearly stepping on some of them, until amphibian, a single Koolasuchus father, shouted at Pierce, calling him out on his slow pace and blocking the road ahead, to which Pierce coldly responded by calling out the shortness of the Koolasuchus' head and how the start was drawing attention to himself. Timidly, the Koolasuchus asked to be left to pass by with his family: Pierce dismissively let the start pass and continued to live each other, ignoring the male Koolasuchus's statement to his own family that Manfred would starve to death.

Further down the road, Pierce stood atop a ledge alone, until a small Eoraptor named Hallo ran into him, asking to be hidden from two angry Pachycephalosaurus named Brone & Moldu. The two Pachys intended to brutalize Hallo for ruining their meal, which Pierce was indifferent towards, but Hallo, seeking protection, hid behind the Kentrosaurus's legs. Pierce stayed indifferent and brought up that pachys were herbivorous, to which Moldu pointed out that they'd kill Hallo out of fun, which displeased Pierce. This did not register with the pachys, who still wished to harm the Eoraptor, and Pierce, bluffing, told the pachys that if they crossed the sinkhole dividing them, they might take Hallo. Hallo, overconfident in his safety, called out another bluff, throwing a rock at them, which landed on the sinkhole, which had since dried up, revealing the bluff.

The two pachys rushed at Pierce and Hallo, and Pierce used his tail to stave the pachys off, shoving them back onto the ground, when Brone rushed in to charge Hallo, but Pierce seized the Pachy by his horn and flung him around, throwing Brone. Moldu also rushed in, stampeding towards Hallo when Pierce scooped the Pachy in his tusks and threw him aside. Hallo, happy to see that the pachys were halted, rushed to hug Pierce, causing the kentrosaurus to lose his footing and slide down the ledge, no worse for wear. Hallo landed to Pierce head, when Rick, a Utahraptor, and Brill, a Dimorphodon, saw them both, when he got up; Rick went to Pierce, offering to join him. Pierce sarcastically invited Rick, Brill and Hallo travel through the whole journey north rather than south before coldly leaving the dimorphodon and eoraptor. Hallo, thinking he was safe, thanked Pierce for his help and set off alone.

More to be added.

Jurassic World: Camp Cretaceous
A Kentrosaurus was cloned some time during or before 2016 on a secret island owned by Mantah Corp by Dr. Mae Turner, a paleo-neurobiologist that named the stegosaur "Pierce". Mae raised Pierce and kept him within a desert biodome, alongside a Smilodon. There she studied his brain reactions and found a way to somewhat communicate with him via replaying Pierce' own sounds back at him once she could understand what they meant on a basic level.