Knuckles is an anthropomorphic red echidna with large, dreadlock like spines, a white crescent mark on his chest, and thick yellow and red boots. He is most famous for his large white gloves, which feature two sharp, protruding spikes on each knuckle. Knuckles acts with intense, laser focused determination, treating the mission with extreme gravity due to his sacred duty as a guardian. While he is fiercely independent, serious, and deeply honorable, his stubborn and hot-headed nature can sometimes cloud his judgment.

Sonic is a bright blue anthropomorphic hedgehog with large, backward-pointing quills, expressive green eyes, peach colored skin on his face and torso, and his iconic red and white sneakers. When Sonic fights for the Chaos Emeralds, he acts with supreme confidence, thrilling excitement, and an easygoing, cocky attitude. He treats the high-stakes chase like a fun game, often smirking and making witty jokes even when facing extreme danger. However, beneath his impatient, thrill-seeking exterior lies a deeply heroic heart; he stays completely focused on the race because he knows he must secure the emeralds to protect his friends.

Amy Rose is a bright pink hedgehog with a stylish bob cut of quills, a vibrant red dress, and her signature Piko Piko Hammer.When she fights for the Chaos Emeralds, she acts with immense passion, cheering wildly for Sonic while showing a fiercely competitive and unstoppable drive to prove her own strength. Amy approaches the dangerous search with a bright, hopeful attitude, using her heavy hammer and surprising agility to smash through obstacles.

Tails is a brilliant young, two tailed fox with bright yellow orange fur, white fur on his chest and muzzle, and large blue eyes. Once he fights for the Chaos Emeralds, he relies on his genius intellect and brave heart rather than raw speed, flying through danger using his twin tails like helicopter blades. He supports Sonic with incredible high tech gadgets and vehicles, matching his mechanical skills against Dr. Eggman.

Shadow is a sleek black anthropomorphic hedgehog with sharp crimson stripes on his quills, arms, and legs, and piercing red eyes. When he fights for the Chaos Emeralds, he acts with ruthless efficiency, a cold and brooding demeanor, and absolute focus on his goals. Unlike Sonic, Shadow views the emeralds as tools of ultimate power to fulfill his purpose, using his Hover Shoes and dark Chaos Control abilities to warp time and space to seize the emeralds before anyone else can.

Rouge the Bat is a sleek white bat with teal eyes, a pink heart shaped breastplate, a black jumpsuit, and distinct black wings.Fighting for the Chaos Emeralds, she acts with a playful, cunning, and highly seductive charm, viewing the magical gems as the ultimate treasures for her jewel collection. As a master thief and government spy, she relies on stealth, acrobatics, and powerful kicks to outsmart rivals, gladly manipulating situations to steal the emeralds for her own.

Dr. Eggman is a roly poly mad scientist with a bald head, a massive mustache, a red jacket, and goggles. When fighting for the Chaos Emeralds, he acts with arrogant greed and cruel determination to fuel his maniacal schemes. He builds giant robotic armies and weaponized mechs, hunting the gems to power his dangerous inventions and finally construct his ultimate dream empire.

Metal Sonic is a sleek, blue robotic clone of Sonic with glowing red optical sensors, sharp metal spikes, and a jet engine built into his torso. Fighting for the Chaos Emeralds, he operates with cold, silent efficiency and an obsessive desire to prove himself superior to his flesh and blood counterpart. He hunts the gems with ruthless precision. Upon seeing Sonic, his circuits flare with pure hatred as he locks his targets, charges his engines, and attacks at blistering speeds to completely destroy his rival.