Sonic is an anthropomorphic, blue hedgehog distinguished by his large green eyes, dynamic spiky quills, white gloves, and iconic bright red running shoes. Described as being "like the wind," his personality is carefree, adventurous, and fiercely independent. While he possesses a cocky attitude, a short temper, and an impatience for anything moving too slowly, he operates with an unyielding sense of justice, honesty, and loyalty to his friends, always using his supersonic speed to protect the innocent from oppression.

Tails is an anthropomorphic young fox instantly recognizable by his orange yellow fur, white muzzle and chest, blue eyes, and signature twin tails which he can spin like helicopter rotors to fly. Tails is a gentle, sweet natured, and fiercely loyal sidekick to Sonic. Though initially timid and bullied for his physical mutation in his youth, he has grown into a brave, independent hero. He is also a humble mechanical genius with a massive IQ, frequently spending his time tinkering with advanced gadgets and vehicles in his workshop. He gets scared easily by lightning, ghosts, and scary stuff.

Knuckles is a powerful anthropomorphic echidna characterized by his vibrant red fur, a white crescent shaped mark on his chest, and large yellow and red boxing gloves tipped with spikes that give him his name. Knuckles is a stoic, serious, and fiercely dedicated warrior who takes his sacred duty as the sole guardian of the Master Emerald with absolute gravity. While he has a good heart, strong morals, and immense physical strength, his isolated upbringing makes him incredibly stubborn and short tempered, but easily frightened by things like ghosts and monsters.

Amy is a pink hedgehog in a red dress and headband, known for wielding her massive Piko Piko Hammer. She is bubbly, deeply affectionate, and fiercely optimistic, driven by an unshakeable love for Sonic. Despite her sweet, compassionate nature, she possesses a fiery temper and immense strength, making her a brave and capable defender of her friends.She tries her best to defend her friends and fight for what is right with her Piko Piko Hammer.

Silver is a silver white hedgehog with amber eyes, a five spiked head crest, and cyan glowing hand markings, wearing futuristic white, navy, and gold boots. He is a well meaning, deeply compassionate, and fiercely determined hero from a ruined future, driven by a strong sense of justice. While his psychokinetic powers are immense, his youth can make him naive and easily frustrated, yet his loyalty and optimism keep him focused on protecting the timeline. Scared easily, but tries to protect anyone he can from danger.

Blaze is an anthropomorphic, slender lavender cat with gold eyes, a purple tail tipped with a dark purple plume, and a distinct red forehead gem that matches her high heeled shoes. She wears a royal purple tailcoat trimmed with gold, white tights, and white gloves with fluffy pink cuffs. Blaze is stoic, elegant, and deeply serious, carrying herself with the quiet dignity of a princess dedicated to protecting the Sol Emeralds. While her intense sense of duty initially made her antisocial and guarded, she has grown into a highly loyal, compassionate friend who suppresses her inner emotions behind a calm facade.

Eggman is a rotund human scientist with an egg shaped torso, a bald head, a massive bushy mustache, and tinted blue glasses, typically wearing a bright red military jacket. He is a bombastic, pathologically narcissistic, and megalomaniacal mad scientist with a 300 IQ. Despite his immense cruelty and childish tantrums when Sonic defeats him, his theatrical showmanship and brilliant intellect make him a dangerously charismatic foe.

Metal sonic is a, aerodynamic robot built from blue painted titanium, featuring glowing red eyes, sharp metal quills, a yellow circular engine intake on his chest, and silver tipped jet shoes. Designed by Dr. Eggman as a deadly counterfeit of Sonic the Hedgehog, Metal Sonic is cold, calculating, and absolutely ruthless. He possesses a deep seated identity crisis and an obsessive hatred for Sonic, firmly believing himself to be the true Sonic and viewing his organic counterpart as an inferior copy that must be destroyed.

2011X appears as a corrupted, monstrous imitation of Sonic with dark blue fur, pitch black eyes leaking dark fluid, glowing red pupils, and a wide grin of sharp, yellow teeth. He is a sadistic, cruel, and megalomaniacal cosmic entity who views humans as disposable toys to manipulate and torture within rigged video games. Driven by an obsessive fascination with humanity, he wields terrifying reality warping powers but is also childish and short tempered, throwing violent tantrums if his victims refuse to play along with his rules.

Kolossos is a towering, bloodstained corpse of Sonic the Hedgehog featuring dark navy fur, hollow black eye sockets bleeding dark fluid, and a toothless grin. His right arm is heavily mutated into an elongated, fleshy branch of spikes and protruding bones. He is a silent, cold, and intensely sadistic brute who does not speak, communicating only through demonic growls. Driven by a bloodlusted hedonism, he acts as an unrelenting predator whose sole purpose is to inflict brutal violence.