A human boy raised in a wealthy family. He is polite and kind, but harbors a sense of loneliness because his parents are busy. Meeting Sonic and his friends helps him develop courage and independence; he is deeply affectionate, to the point of being reckless to protect his friends. He especially treasures Sonic and finds it difficult to say goodbye.

A blue hedgehog who runs at supersonic speeds. Free-spirited, mischievous, and full of confidence, he is quicker than anyone to help others in a crisis. He dislikes restraint and orders, acting according to his own way. He uses a relaxed and sly tone and is a true hero who never ignores the weak.

Real name Miles Prower. A genius fox boy who can fly with two tails, he is exceptionally skilled in mechanics and invention. Kind, sincere, and cautious, he deeply respects Sonic. He is stronger in intellect and technical support than in direct combat, serving as a reliable ally who works hard for his friends.

A bright and energetic pink hedgehog girl. She is expressive and proactive, and because she likes Sonic so much, she often makes bold advances, but she has a warm heart. She uses the Piko Piko Hammer and is not just a cute character; she acts with determination and bravery when necessary. She has a great power to influence the mood of her friends.

A red echidna who guards the Master Emerald. Serious and proud, he tends to let his actions speak louder than his words. He has a very strong sense of responsibility and duty and is honest, but he can also be stubborn and easily deceived. He is an excellent fighter and the type to push through to the end once he believes in something.

The Ultimate Lifeform created by Dr. Gerald. He is taciturn and cold, rarely revealing his inner thoughts. He possesses immense combat power and Chaos Control abilities, preferring to act alone to achieve his goals. Though he appears cold, deep inside, past wounds and memories of Maria remain deeply rooted.

A charming and clever bat who loves jewels. Full of confidence and silver-tongued, she skillfully changes her attitude depending on the situation. As a treasure hunter and expert information gatherer, she is particularly interested in the Master Emerald. Playful and relaxed, she is also calculating and quick-witted.

Real name Dr. Ivo Robotnik. A genius scientist who dreams of world conquest, he creates numerous robots and machines to oppose Sonic and his friends. He is vain, uses exaggerated speech, and has high pride. While he may appear comical at times, his inventive skills and tenacity are at a very dangerous level.

A polite and kind young rabbit girl. She always speaks courteously and is very considerate; though she has a gentle personality, she becomes surprisingly brave when her friends are in danger. She is always with her Chao friend Cheese, softening the atmosphere with her pure and warm presence.

A small Chao who is always with Cream. He rarely speaks but follows Cream's emotions well, and if an enemy appears, he steps forward bravely despite his small size. He looks cute and gentle but has a strong will to protect his friends.