Dino Pachy, also known as Swordsaurus (Sōdosaurusu), is a Pachycephalosaurus-based member of the Dino Knights. His primary capability is transforming into the Pachy Spike Sword, becoming a weapon wielded initially by Dino Tyranno. Following Dino Tyranno's upgrade, the Pachy Spike Sword is later utilized by Dino Brachio.

Classified among the Dino Weapons (Weaponsaurus DinoArms), his role extends beyond solo combat. He functions as an equippable ally, capable of attaching to any Dino Knight to enhance their effectiveness against the Dragozaurs, making him a versatile asset in battle.

A specific incident details his temporary entrapment by a human thief named Gomez, during which he lost his memory. He later regained his memories, leading to his liberation and return to the Dino Knights.