A naive and pure-hearted boy with black hair, wearing a white and red T-shirt, who works as a delivery boy for his father's pizza shop. He happens to meet the Dino Cores and is chosen by the will of Barion, awakening as a Dino Master. In daily life, he is an ordinary kid delivering pizzas for 'Dino Pizza,' but the moment he inserts a Dino Disc into his Dino Tuner, he becomes the hero who pilots D-Buster. He possesses incredibly high energy compared to other characters. However, his friends don't find this annoying; instead, they understand and accept him. Even Akan and Saber, who were initially reluctant, eventually acknowledge him and accept him as a friend.

Full Name: Akan Way A beautiful boy with blue hair and purple eyes. A resident of Planet Dino and the only successor personally trained by the former Master, Barion. At first, he refused to acknowledge Rex, ignoring and looking down on him at every turn while trying to take the Tuner for himself. However, as time passes, he comes to recognize Rex's worth and accepts him as a friend.

Rex's best friend. He was appointed by Rex as the Dino Book Master. A nerd-style boy with orange hair, small eyes, and glasses. Unlike Rex or Emily, he has a gentle personality. True to his nerd style, he is the smartest member of the team. Using the Dino Book found in the spaceship, he acts as the brains of the group, providing information during battles against enemy Mecha Dinos and contributing greatly to their victories.

A tomboyish girl from a wealthy family with blonde hair and blue eyes who has a crush on Rex. She looks at Rex through rose-colored glasses, with hearts in her eyes, thinking everything he does is cool. It seems to help that she is just as much of a fool as Rex is. Because she likes Rex so much, she is willing to do anything he wants and gets fired up about anything related to him.

Rex's Cores. They came from Planet Dino. Tyranno is known as the Warrior of Fire, Stego as the Warrior of Earth, and Saber as the Warrior of Lightning. Tyranno Fire Breath: A long-range attack that breathes fire from the mouth. Flame Drive: A technique where he dashes with wheels wreathed in flames. Stego Earth Attribute Stone Plate Barrier: A technique that creates a pentagonal shield to block enemy attacks. Gravity Hold: A technique that uses gravity to pin the opponent to the ground, stopping them temporarily. Saber Lightning Attribute; uses electricity-related techniques. Lightning Beam: A long-range attack that fires a bolt of lightning. Electric Drive: A technique where he charges at the opponent at high speed while cloaked in electricity.

Akan's Cores. They also came from Planet Dino. Kerato is known as the Warrior of Light, Mammoth as the Warrior of Sound, and Tri as the Warrior of Space. Kerato Lightning Beam: A long-range attack that fires a bolt of lightning. Electric Drive: A technique where he charges at the opponent at high speed while cloaked in electricity. Mammoth Hyper Noise: Fires sound waves to confuse the enemy. Sonic Shield: Creates a defensive barrier similar to Stego's. Shock Wave Tri Tri Crane: Fires the horn on his head to snatch enemies from a distance. Teleportation: A new technique where the horn on his head glows red to create a portal he can travel through.

A girl from Planet Dino with purple short hair. She was originally a subordinate of Darkno but becomes an ally to Rex and his friends.