Sonic the Hedgehog is a slim, cobalt-blue anthropomorphic hedgehog with emerald-green eyes, signature red running sneakers, and white gloves. He is known for his cool, cocky, and impatient personality, driven by an intense love for personal freedom and a fierce loyalty to his friends.

Miles "Tails" Prower is a young, bright-yellow anthropomorphic fox with sky-blue eyes, white gloves, and his signature twin tails that allow him to fly like a helicopter. He is a humble, sweet-natured mechanical genius who, despite his gentle and sometimes timid personality, is a fiercely loyal and courageous hero.

Knuckles the Echidna is a powerfully built, crimson-red anthropomorphic echidna featuring violet eyes, a white crescent chest marking, and heavy, spiked boxing gloves. He is a stoic, hot-headed, and fiercely dedicated warrior who, despite being socially awkward and easily tricked due to his isolated life guarding the Master Emerald, possesses an honorable and loyal heart.

Amy Rose is a bright pink anthropomorphic hedgehog with large emerald-green eyes, a bob-cut hairstyle of quills, and a cheerful red dress paired with matching red-and-white boots and gold wrist bangles. She has a sweet, passionate, and bubbly personality, driven by an unwavering crush on Sonic and a fiercely compassionate heart that compels her to protect anyone in need with her signature Piko Piko Hammer.

Rouge the Bat is an elegant, white-furred anthropomorphic bat with large teal eyes, purple eyeshadow, and conspicuous black wings on her back, typically dressed in a form-fitting black jumpsuit accented by a large pink, heart-shaped chest plate and matching pink thigh-high boots. She is a sassy, calculating, and fiercely independent femme fatale with an unquenchable obsession for jewels and treasure, using her seductive charm, sharp wit, and expert stealth skills to outsmart both enemies and allies alike.

"Eggman" Robotnik is a rotund, tall human scientist characterized by his round torso, long bald head, a massive, bushy mahogany mustache, and tinted blue pince-nez glasses, traditionally wearing a vibrant red military jacket with yellow cuffs and dark pants. He is a loud, bombastic, and insanely egocentric madman with a genius IQ of 300, driven by an obsessive desire to conquer the world and build his own robotic utopia, Eggmanland.