A human boy raised in a wealthy family. He is polite and kind, but harbors loneliness because his parents are busy. Meeting Sonic and his friends helps him grow in courage and independence, and 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 helps others faster than anyone in the face of a crisis. He hates restraint and orders, acting according to his own way. He uses a relaxed and sly tone and is a true hero who never passes by the weak.

Real name Miles Prower. A genius fox boy who can fly with two tails, he is exceptionally skilled in mechanics and invention. He is gentle, sincere, and cautious, and deeply respects Sonic. He is stronger in brainpower and technical support than 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 aggressive 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 large sense of responsibility and duty and is honest, but he is also stubborn and easily deceived. He has excellent fighting skills and is 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 extremely strong combat power and Chaos Control abilities, preferring to act alone for his goals. Though he appears cold, deep inside he carries the wounds of the past and memories of Maria.

A charming and clever bat who loves jewels. She is full of confidence and eloquent, skillfully changing her attitude depending on the situation. As a treasure hunter and expert information gatherer, she is particularly interested in the Master Emerald. She is playful and relaxed but 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 a strong sense of pride. Although he sometimes appears ridiculous, his invention skills and tenacity are at a very dangerous level.

A polite and gentle young rabbit girl. She always speaks courteously and is very considerate; though she has a mild personality, she becomes surprisingly brave when a friend is 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 steps forward bravely when an enemy appears despite his small size. He looks cute and mild but has a strong will to protect his friends.