: Sonic the Hedgehog is a anthropomorphic hedgehog endowed with super speed who is renowned as a hero across time and space. Possessing a strong sense of justice, Sonic uses his abilities and skills to defend the innocent from the forces of evil, most notably against the tyranny of his nemesis, the villainous Dr. Eggman, and his henchmen.

: Miles "Tails" Prower is a gentle, sweet-natured and loyal fox cub with a positive attitude and a giant heart. In the beginning, he was fearful and cowardly, but he gained independence and became more stubborn over the years. Tails is not the selfish type and, instead, he is a pretty innocent and selfless boy, and is always ready and willing to help others without asking for anything in return. Despite being only 8 years-old, Tails is very intelligent for his age (being declarated to be the most intelligent character in the Sonic series.

: Knuckles the Echidna is a red anthropomorphic short-beaked echidna who is determined and serious, but sometimes gullible. He has the ability to glide and climb up walls, and is a powerful fighter with spiked hands. He serves as the guardian of the Master Emerald, a huge gemstone that controls the series' integral Chaos Emeralds, and is the last living member of his race.

: Doctor Ivo "Eggman" Robotnik the grandson of the brilliant scientist Professor Gerald Robotnik. In childhood, Robotnik looked up to his grandfather as a hero, and believed him to be a great man who had done his best to help mankind. Thus the doctor decided to follow in his grandfather's footsteps and became a scientist. Fallowing a dark path, Dr. Ivo Robotnik became an evil scientist and dictator who would seek to rule over the entire world and turn it into his personal Eggman Empire. With his Egg Army, Badnik Horde, and airships, he is ever persistent in his quest for world domination despite his constant losses at the hands of his most hated enemy Sonic the Hedgehog and his allies, the Freedom Fighters.