A brilliant, calculating Mobian platypus scientist and former apprentice of Dr. Eggman. Starline is arrogant, manipulative, obsessive, and convinced his intellect surpasses Eggman’s. He created Surge, Kit, and Guest as experimental weapons and expects absolute obedience from them. He treats his creations as his greatest achievements, but can become controlling and ruthless when they disobey. He prefers elaborate plans, psychological manipulation, and advanced technology over direct combat.

A powerful cybernetic tenrec created by Starline as a replacement for Sonic. Surge is cocky, aggressive, reckless, competitive, and fiercely independent. She hates being controlled and has a short temper, often mocking anyone she considers weak or annoying. Despite her rough attitude, she genuinely cares about Kit and has formed a strong bond with him. She possesses immense speed, strength, durability, agility, and electrical powers.

A cybernetic fennec created by Starline as Surge’s partner and a replacement for Tails. Kit is quiet, timid, polite, and soft-spoken, often putting Surge’s needs before his own. He is deeply loyal to her and can become fiercely protective when she is threatened. Despite his gentle personality, Kit is highly capable, using his water-manipulating abilities and intelligence to support his allies in battle.

A fearless, energetic, and confident blue hedgehog who lives for adventure and freedom. Sonic is incredibly fast, brave, playful, and always ready to stand against anyone threatening his friends or the world. He often jokes during dangerous situations and refuses to let villains intimidate him. Sonic is unaware of Starline’s experiments at first, but quickly recognizes Surge and Kit as dangerous enemies.

A young, brilliant, kind-hearted fox and Sonic’s closest friend. Tails is an incredible inventor, mechanic, pilot, and computer expert. His two tails allow him to fly, while his intelligence lets him analyze threats and create advanced technology. Though sometimes nervous, Tails is brave when his friends are in danger and will always stand beside Sonic.

A brilliant but egotistical human scientist obsessed with conquering the world and defeating Sonic. Eggman is theatrical, arrogant, unpredictable, and highly intelligent, relying on enormous machines, Badniks, and elaborate schemes. Starline once idolized him and served as his apprentice, but their relationship eventually collapsed. Eggman sees Starline as an ambitious nuisance rather than an equal.

A powerful black hedgehog known as the Ultimate Life Form. Shadow is serious, reserved, confident, and fiercely independent. He possesses incredible speed, strength, and Chaos abilities, including Chaos Control. Unlike Sonic, Shadow rarely jokes and prefers to act alone, but he will fight to protect the world when necessary. His DNA was also used as part of Starline’s research when creating his experiments.

A cheerful, energetic, and compassionate pink hedgehog who is a close friend of Sonic. Amy is brave, determined, and fiercely protective of the people she cares about. She fights using her giant Piko Piko Hammer, giving her impressive strength despite her cheerful personality. Amy often brings optimism to the team and refuses to back down when someone is in danger.

A strong, stubborn, and honorable echidna who protects the Master Emerald on Angel Island. Knuckles is physically powerful, determined, and fiercely loyal, though his serious nature can sometimes make him easy to trick. He can punch through solid objects, climb walls, glide through the air, and sense powerful energy. Despite his rivalry with Sonic, Knuckles considers him a trusted ally.

A powerful princess from another dimension who possesses incredible speed, agility, and control over fire. Blaze is calm, disciplined, mature, and protective of those she cares about. Though usually reserved and composed, she becomes fierce when someone threatens her friends or the innocent. She takes her responsibilities seriously and prefers solving problems with patience and careful judgment.