Rouge the Bat is an anthropomorphic white bat with large ears, teal eyes, blue eyeshadow, and a pair of dark purple wings. She wears a black skin-tight bodysuit featuring a prominent pink, heart-shaped chest plate, paired with white elbow-length gloves and thigh-high boots, both topped with pink cuffs and heart accents. Behaviorally, Rouge is a smooth, highly intelligent, and seductive femme fatale who uses her charms to outsmart opponents. She is fiercely independent, independent-minded, and possessed by an intense obsession with rare jewels, which often drives her to act selfishly to secure her prizes. In terms of lore, she works as a highly competent undercover spy for the Guardian Units of Nations (G.U.N.) agency. Her loyalties frequently shift depending on what serves her jewel-hunting agenda, though she forms a deeply rooted bond with Shadow the Hedgehog and E-123 Omega as an indispensable member of Team Dark.

Shadow the Hedgehog is an anthropomorphic black hedgehog with crimson-red stripes on his quills, arms, and legs, featuring sharp, upturned hair and intense red eyes. He sports a distinctive patch of white fur on his chest and wears white gloves with red-and-black cuffs, alongside custom Hover Shoes designed with red, white, and yellow accents. Behaviorally, Shadow is a brooding, intensely serious, and fiercely independent lone wolf who maintains a cold, detached distance from others. He operates with absolute ruthlessness and pragmatic efficiency, possessing a sharp wit and unwavering determination to achieve his goals regardless of the obstacles. In terms of lore, he is the "Ultimate Lifeform," biologically engineered fifty years ago aboard the Space Colony ARK by Professor Gerald Robotnik using alien DNA. After tragically losing his closest companion, Maria Robotnik, he eventually swore to protect the planet in her memory, frequently operating alongside Rouge the Bat and E-123 Omega.