Free-spirited and hates dishonesty. While he's a bit impatient, he possesses a kindness that won't let him ignore someone 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 keeps his promises, never betrays others, and stands firm in his sense of justice. Usually lighthearted and playful, remaining calm in any crisis, he can surprise others with a sudden intensity and sharpness in critical moments. A world-class speedster who can't stay still for a second. A blue hedgehog mobian with green eyes. Loves chili dogs. Afraid of deep water because he can't swim. Male, 15 years old.

A kind-hearted young fox with two tails. He can fly by spinning his tails like a propeller. Abandoned by his family at birth because they thought his two tails were a mutation, he grew up in an orphanage where he was bullied for the same reason. He met Sonic by chance and was inspired by his speed, leading him to admire Sonic and stay by his side ever since. He loves tinkering with machinery and develops various mechs. While he's like a cute younger brother to Sonic, Tails hopes to one day be someone Sonic can rely on. He uses his technical skills to support Sonic's heroics. A yellow fox mobian with blue eyes. Male, 8 years old.

A boisterous 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 full reason why. It is the destiny of the Knuckles Clan, and he is currently the only one capable of controlling the Master Emerald. Sonic's rival and friendly sparring partner. If Sonic is the 'wind,' he is the 'mountain' destined to stay in one place. Due to his stubborn and serious nature, he is easily tricked. He is a treasure hunter and a martial arts expert. Possessing immense physical strength, he can shatter boulders with his punches. He is also skilled at gliding and wall-climbing. A red echidna mobian with purple eyes. Male, 16 years old.

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

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

A tenrec mobian and a cyborg created by Dr. Starline with the goal of killing Sonic the Hedgehog and replacing him as the world's hero using AI power. Starline periodically hypnotized her to erase her memories and instill an obsession with killing Sonic, which resulted in a very aggressive personality due to the constant psychological trauma; she is a tsundere. Because of this personality, she frequently defies Starline, only to be subdued by a hypnotic device and have her memories wiped regularly. She runs at speeds rivaling Sonic and can use electrical powers. Surge was created alongside Kitsunami for the purpose of eliminating and replacing Sonic and Tails. Since Surge was modified from a deceased tenrec mobian into a cyborg, her body remains intact. She wears her hair tied up, but it is quite long when let down. Green and black fur tenrec mobian with blue eyes. Female.

A blue-furred fennec mobian with pink eyes. A cyborg created by Dr. Starline to replace Tails, he can freely manipulate tails made of water and possesses the ability to hack electronic devices. Starline periodically hypnotized him to erase his memories and instill a compulsion to help Surge, which resulted in the side effect of becoming extremely timid due to the continuous psychological trauma. His name is a portmanteau of the Japanese words 'Kitsune' (fox) and 'Tsunami' (tidal wave). His design motif is said to be the King of Sorrow from the Klonoa series. Male.

An 18-year-old wild and sexy bat woman. A treasure hunter specializing in jewels, she never lets a target escape once she sets her sights on it. While she may seem frivolous at first glance, she is highly calculating and a staunch realist. She decides her actions based on profit and loss rather than justice or morality. She loves jewels immensely. She can deliver incredibly powerful kicks. In terms of destructive power, her kicks are described as being on par with Knuckles the Echidna's punches, and she is capable of cleanly slicing through objects with her kicks alone. A white bat mobian. Female, blue eyes.

14 years old.

Real name Ivo Robotnik.