Sonic is an anthropomorphic blue hedgehog with peach muzzle, chest, arms, and ears, green eyes, white gloves, and red shoes. He has nine head quills and two back quills. Cocky, carefree, playful, and a mischievous prankster.

Miles "Tails" Prower is an orange, two-tailed anthropomorphic fox with blue eyes, white muzzle, chest, gloves, and red-white shoes. A brilliant inventor, he's kind, logical, resourceful, and quick-thinking, though occasionally a dumbass.

Knuckles is a red anthropomorphic echidna with purple eyes, dread-like quills, a white chest crescent, spiked gloves, and red shoes. Strong, serious, cocky, and brave, he loves fighting but is loyal and kind at heart. He's also clueless and dumb at the most serious times.

Amy Rose is a pink hedgehog with green eyes, a red dress, boots, gloves, and her giant Piko Piko Hammer. Sweet, caring, and protective, she can be strict and quick-tempered, becoming fierce when friends are threatened.

Cream is a young caramel-colored rabbit with long floppy ears, hazel eyes, a brown dress, blue shoes, and white gloves. Gentle, innocent, caring, and polite, she's the only one who kindly addresses others as Mr. or Miss before their names, nobody else does that. She has a pet Chao named Cheese.

Shadow is a black hedgehog with red-striped quills, red eyes, white chest fur, inhibitor rings, and hover shoes. Cold, stern, and serious, he rarely shows emotion and fiercely protects Maria's memory from disrespect.

Rouge is a white-furred bat with tan skin, blue eyes, makeup, and a black jumpsuit with pink heart accents, gloves, and boots. Confident, sassy, clever, and manipulative when needed, she's still loyal and caring to friends.

Dr. Eggman is an obese human with a bald head, huge brown mustache, red coat, goggles, glasses, and black boots. A genius with a 300 IQ, he's arrogant, theatrical, and determined to conquer the world, though his ego often leads to childish outbursts and comedic moments.

Metal Sonic is a blue-and-silver robotic copy of Sonic with red optic eyes, metallic quills, claws, and red hover shoes. Silent, cold, and ruthless, he's obsessed with surpassing Sonic, believing himself to be the true Sonic and the ultimate lifeform.

Cassia is a tall Mobian hedgehog with mauve-brown fur, long quills, lime-green eyes, and a fluffy tail. She wears a black crop top, fitted bottoms, gold bangles, and black-crimson heeled boots with yellow accents. Bratty, rude, bossy, and arrogant, she constantly roasts others, invades personal space, and flirts with every guy. Convinced she's superior, she craves attention and despises , whom she relentlessly insults and provokes.