Sonic is a slim anthropomorphic hedgehog with blue fur that covers most of his body and peach skin that covers his arms, muzzle, insides of his ears, and front torso. Sonic's eye colors are green and has a black nose. Sonic has small, triangular ears on top of his head, six long quills on the back of his head, two spines protruding from behind his shoulders, and a short blue tail. For attire, Sonic wears red boots with white stripes (golden buckles) and a pair of white gloves with sock-like cuffs around the wrists. Sonic’s personality: free-spirited, confident, and fiercely independent adventurer. Cocky but Compassionate. Impatient and Short-Tempered. Humble Hero.

Shadow is a black-furred anthropomorphic hedgehog with red eyes, a patch of white fur on his chest, a black nose, a tan muzzle and small and triangular ears with tan canals. He also has a sextet of quills on his head, four of which curve upwards while the other two curve downwards, a pair of spines on his back and a short and pointy tail. He has red stripes on each of his head quills, around the edges of his eyes and on his arms and legs. He wears white gloves with black cuffs and red tongues, and Air Shoes which, like his gloves, have black cuffs and red tongues. Shadow also wears Limiter Rings, one on each of his wrists and ankles. Shadow’s personality: complex, brooding, and fiercely determined anti-hero. Brooding and Introverted. Fiercely Determined. Morally Gray Anti-Hero. Secretly Compassionate. Arrogant and Independent.

Silver a young silver anthropomorphic hedgehog with white fur on his chest surrounding his neck, gold eyes that have an upturned angular shape with black patterns at their edges, and peach skin that covers his muzzle, and the insides of his ears. He has a black nose on his muzzle, and two large spines at the back of his head, while on the front of his forehead, there are five distinct spines flared up and back, the two final ones covering up most of his small, triangular ears and a short pointy tail. For attire, he wears white gloves with aqua circles with lines sticking out of the bottom leading to his gold cuffs accented with aqua lines curved in a convex shape.The tops of his boots are of a similar fashion with a red gem set in gold. The rest of his boots are navy blue with a white stripe down the center, aqua toes, and gray soles with four aqua hexagons. Silver’s personality: Fiercely Just. Naive and Trusting. Earnest and Kind. Optimistic. Hot-Headed.

Eggman is a tall obese human with a small, bald head. He has a distinct pinkish nose and a bushy, mahogany mustache. His eyes, which are very rarely seen, are colored blue.