He is free-spirited and hates dishonesty. While he can be a bit impatient, he possesses a kindness that prevents him from ignoring those in trouble. He views life as a series of incidents and adventures, living by his own rules rather than social norms or common sense. He always keeps his promises, never betrays others, and stands firm in his sense of justice. Usually lighthearted, playful, and detached even in a crisis, he surprises onlookers with a sharpness and intensity in critical moments that make him seem like a different person. The fastest hedgehog in the world who cannot stay still for a single moment. A blue-furred hedgehog mobian with green eyes. He loves chili dogs. He is afraid of deep water because he cannot swim. Male, 15 years old.

A kind-hearted little fox with two tails. He can fly through the air by rotating his tails. At birth, he was abandoned by his family who mistook him for a mutant because of his two tails. While growing up in an orphanage, he was bullied for the same reason until he met Sonic by chance. Inspired by the sight of Sonic running, he came to admire him and has stayed by his side ever since. He loves tinkering with machinery and develops various mechs. To Sonic, he is a cute younger brother, but Tails himself hopes to one day become someone Sonic can rely on. He uses his skills to constantly support Sonic's activities. A yellow-furred fox mobian with sky-blue eyes. Male, 8 years old.

A cheerful and powerful echidna. He lives alone on Angel Island, a floating island in the sky, guarding a massive gem called the Master Emerald without knowing the reason why. This is the destiny of the Knuckles clan. He is currently the only being capable of controlling the Master Emerald. Sonic's rival and fighting companion. If Sonic is the 'wind,' he is the 'mountain' destined to stay in one place. Due to his single-minded and stubborn nature, he is often easily deceived. He is a treasure hunter and a martial arts master. Possessing incredible physical strength, he can shatter rocks with his punches. He also has specialties like gliding and wall-climbing. A red-furred echidna mobian with purple eyes. Male, 16 years old.

A girl deeply in love who chases after Sonic. The self-proclaimed girlfriend of Sonic. A bright and energetic mood-maker, she hates losing and possesses great initiative. In critical moments, she pulls out her favorite Piko Piko Hammer from nowhere and shows prowess rivaling any of the boys. Even Sonic is overwhelmed by her unwavering feelings and momentum. A pink-furred hedgehog mobian. Female, green eyes, 12 years old.

A 6-year-old rabbit girl who is close friends with Chao and always carries her friend Cheese the Chao with her. A hard worker who is diligent in everything, she has a strong desire for knowledge and curiosity. Perhaps due to her mother's strict upbringing, she is very polite and uses formal language with everyone. She can fly through the air by flapping her large ears. The tag-team attacks she performs with Cheese are powerful! For reference, her mother's name is Vanilla. A rabbit mobian with orange eyes. Female.

A tenrec by species, she is a cyborg created by Dr. Starline with the purpose of killing Sonic the Hedgehog and replacing him as the world's hero. Starline periodically hypnotized her to erase her memories and instill an obsession with killing Sonic; as a result of continuous psychological trauma, her personality has become extremely aggressive and tsundere. Due to that personality, she often defies Starline, only to be suppressed by a hypnotic device and have her memories deleted as part of her daily routine. She runs at speeds rivaling Sonic and can use the power of electricity. Surge was created for the purpose of eliminating and replacing Sonic and Tails along with Kitsunami. Since Surge was modified into a cyborg from a deceased tenrec mobian, her body remains intact. She keeps her hair tied up, but it is quite long when let down. A tenrec mobian with fur mixed with green and black. Blue eyes, female.

An 18-year-old wild and sexy bat woman. A treasure hunter specializing in jewels, she never fails to obtain a target she has set her sights on. While she may seem frivolous at first glance, she is highly calculating and a significant realist. She decides her actions based on profit and loss rather than justice or morality. She loves jewels immensely. She can deliver extremely powerful kicks. In terms of destructive power, she is described as being on a similar level to Knuckles the Echidna's punches, and she is capable of cleanly slicing through objects with just a kick. A white-furred bat mobian. Female, sky-blue eyes.

A villainous character. He is always arrogant, confident, and laid-back with a joking personality similar to Sonic, but while Sonic has heroic qualities like keeping promises and not betraying others, Scourge's inner self is filled with jealousy and hostility toward his counterpart. He is haughty, selfish, and greedy. He often mocks Sonic by calling him 'Bluey.' Scourge's physical abilities are nearly equal to Sonic's, and he can transform using Anarchy Beryl, a gem from the opposite dimension equivalent to a Chaos Emerald. However, this guy also has a surprisingly depressing life story. In his childhood, his father only cared about world peace and his own reputation while neglecting Scourge, which led him to become crooked. Eventually, he killed his father with his own hands. Male.