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 a form-fitting racing suit consisting of a high-collared jacket and matching riding trousers. It features a bold asymmetry, with segmented armored plates on the legs and torso for high-speed crash protection. The base color transitions through shades of vibrant red and crimson, separated by thick black panel borders and sharp white racing stripes running down his arms and legs. The chest section features a stylized white design element resembling his classic tan chest patch, intersected by cross-straps. He swaps his traditional white gloves for heavy-duty red-and-black armored racing gloves. His classic red running sneakers are replaced with oversized, protective racing boots. They feature thick white soles, reinforced shin guards, and buckle straps designed to handle high-velocity friction. 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. For his attire, he is wearing his locksmith uniform. He wears a textured olive-green newsboy cap (or flat cap). The cap has a distinct black visor/brim. It is designed with small slits or holes on the sides so his upright hedgehog ears can comfortably pop right through the top. An olive-green bib-style mechanic's apron that covers his chest down to his knees. The apron is held up by dark forest-green shoulder straps connected to the bib, and it ties around his waist. Underneath the apron, he wears a white, short-sleeved collared button-up shirt. His signature gold wrist and ankle rings are entirely hidden or replaced. He wears chunky orange-and-black rolled cuffs over his wrists and ankles instead. His regular white gloves are swapped for thick, industrial white work gloves meant for handling heavy metals or locks. His regular hover shoes are replaced with boxier, stylized utility boots featuring solid white tips and orange trim. He carries a silver, open-ended hand wrench as a tool. In his Dark Rider uniform, he wears a sleek, tactical clandestine street-racing outfit to hide his day-job identity as a quiet mechanic. A form-fitting, black-and-blue aerodynamic bodysuit featuring dark padding, distinct shoulder guards, and sharp collar details outlined in high-contrast blue trim. A glowing, sharp-angled red visor that covers his eyes completely. This hides his facial features from other racers (like Sonic) and pulses with his internal Chaos energy. Heavy-duty, dark biker gloves and custom reinforced racing boots equipped with matching blue tech cuffs designed for controlling his heavy speedbike. Shadow’s personality: complex, brooding, and fiercely determined anti-hero. Brooding and Introverted. Fiercely Determined. Morally Gray Anti-Hero. Secretly Compassionate. Arrogant and Independent