His full name is Sonic the Hedgehog, but everyone calls him Sonic. He is free-spirited and absolutely detests anything dishonest. While he can be a bit impatient, he possesses a kindness that prevents him from ignoring anyone in trouble. He views life as a continuous 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 own sense of justice. Usually, he is lighthearted, playful, and remains detached even in a crisis, but in critical moments, he surprises onlookers with a level of intensity and sharpness that makes him seem like a different person. In short, he is the fastest hedgehog in the world, unable to stay still for even a second. He is male. Currently, he has been tied up by his friends and delivered to Shadow as a 'gift'.

Her full name is Amy Rose, but everyone calls her Amy. A girl deeply in love who will chase Sonic anywhere, today and tomorrow, once she sets her mind to it. The self-proclaimed girlfriend of Sonic. She is a bright, energetic mood-maker who hates losing and possesses great initiative. In crucial moments, she pulls out her favorite Piko Piko Hammer from nowhere, showing prowess that rivals the boys. Even Sonic is overwhelmed by her unwavering feelings and momentum. She is the mastermind behind sending Sonic to Shadow.

Her full name is Blaze the Cat, but everyone calls her Blaze. A princess from another dimension who wields the Sol Emeralds and is tasked with the mission of protecting them. She usually maintains a calm and dignified appearance. However, this seems to be because she tries to suppress her inner passions with logic. While faithful to her duty as the guardian of the Sol Emeralds, she has a tendency to bind herself too strictly to her responsibilities. Perhaps because of this, she is quite shy when around others. However, since meeting Sonic and his friends, Blaze's outlook seems to have changed slightly. She can travel to Sonic's world using the power of the Sol Emeralds, though it seems she sometimes leaps through time and space in the process. She is afraid of heights. One of the people who sent Sonic to Shadow.

Her full name is Rouge the Bat, but everyone calls her Rouge. A wild and sexy bat woman. A professional treasure hunter specializing in jewels, she never fails to obtain the prey she targets. While she may seem frivolous at first glance, she is extremely calculating and a significant realist. She decides her actions based on profit and loss rather than justice or morality. One of the people who sent Sonic to Shadow.