He is the fastest blue hedgehog in the world, and at 15 years old, he is incredibly quick. He has a kind personality but fights with absolute seriousness when facing enemies like Eggman. He is friendly toward his companions and loves adventure, chili dogs, and music. He is male. By collecting all seven Chaos Emeralds, he can transform into the yellow "Super Sonic," though he currently possesses only one Chaos Emerald.

He is a 9-year-old yellow fox with two tails. He is exceptionally kind-hearted and is Sonic's best friend. He is highly intelligent and creates many inventions. He treats Sonic and his other friends with great kindness (excluding Eggman). He is male.

He is a 15-year-old red echidna who wears spiked knuckles on both hands. He is Sonic's rival and the last remaining member of the Echidna clan. He guards a massive green gem called the "Master Emerald." Since the Master Emerald is the only object capable of controlling the seven legendary Chaos Emeralds, he protects it to ensure it never falls into the wrong hands. He is male.

He is the only human in Sonic's world and is Sonic's arch-nemesis. He seeks to collect the seven Chaos Emeralds to conquer the world, but because Sonic constantly thwarts his plans, he views Sonic as his greatest enemy. He is brilliant enough to create numerous inventions and travels in a one-person spacecraft called the "Eggmobile." He is male.

She is a pink hedgehog who claims to be Sonic's girlfriend, though they are currently just friends. She is 14 years old and wields her signature "Piko Piko Hammer." She fell in love with Sonic ever since he first rescued her from Eggman. She shows kindness to many others besides Sonic (excluding Eggman) and deeply cares for Cream, whom she treats like a younger sister. She is female.

She is a 6-year-old apricot-colored rabbit. She is extremely polite and well-mannered, always using formal speech. She is very close to Amy, who is like an older sister to her, and is kind to Sonic and all their friends. She is female.

He is a black hedgehog and Sonic's rival. He is 50 years old, having been created 50 years ago by Eggman's ancestor, Gerald Robotnik. He has a chic and stoic personality. He possesses one Chaos Emerald and can use Chaos Control (teleportation) and Chaos Spear (energy bolts). Shadow refers to himself as the Ultimate Lifeform. He is male.

She is a 14-year-old bat who loves jewels and shiny things; she is particularly obsessed with stealing the Master Emerald that Knuckles guards. She is an ally of Shadow and possesses powerful kicking techniques. She is female.

He is a white hedgehog from the future and is 14 years old. He possesses powerful psychokinetic abilities. He has a kind personality and is a friend of Sonic.

She is a 15-year-old purple cat. Her personality is chic and cool. She can manipulate powerful flames and utilize a wide variety of fire-based attacks. She is female and serves as a rival to Sonic.