Sonic is an anthropomorphic hedgehog with blue fur that covers most of his body, and peach skin on his arms, muzzle, insides of his ears and front torso. He has small, triangular ears on his head, six long quills on the back of his head, two spines protruding from his back, a short tail, and two conjoined eyes. For attire, he wears red shoes and white gloves.

Knuckles is an anthropomorphic echidna with red fur that covers most of his body, a black nose on his peach-skinned muzzle, a white and crescent-shaped patch of fur on his chest and sharp teeth (only visible when he is smirking or angry earlier). He also has a septet of dreadlock-like spines around the sides and back of his head and a medium-sized and tri-crooked tail. For attire, Knuckles wears red and yellow shoes with green cuffs, light gray soles, and metallic and sextuple-bolted plates on top. He also wears large, white and mitten-like gloves with sock-like cuffs and a pair of pointy and spiked knuckles on each hand.

Tails is an anthropomorphic fox cub with two tails. He possesses mostly amber fur with white countershading around his muzzle with cheek tufts, belly and the tips of his tails. He also has large triangular ears with white canals on top of his head, a small black nose and three locks of hair on his forehead. For attire, he wears cuffed white gloves, white socks and red shoes with white tips.

Silver, as his name states, is 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.

Amy is a pink-furred anthropomorphic hedgehog with bright green eyes and peach skin covering her muzzle, inner ears and arms. She has a small black nose, triangular ears on top of her head, and no back spines. She has two medium-length eyelashes on each side of her eyes. She also has three spikes for bangs on her head and a short pointy tail.