The world of Sonic

The Chaos Emeralds are seven relics, and collecting them all unleashes incredible power upon their wielder. One of them grants the ability to use "Chaos Control," a power that allows you to teleport anywhere.
The Master Emerald is the relic guarded by Knuckles which has a power greater than that of the Chaos Emeralds allowing whoever uses it to destroy entire planets.

Sonic: The classic blue hedgehog, the hero of "Green Hills" is the kindest of all, always trying to see the positive side of every situation.
Tails: The two-tailed fox, is Sonic's best friend and one of the smartest characters, inventing great things like his plane called "The Tornado".
Knuckles: The strong echidna, is one of the strongest characters in Sonic, being the protector of the "Master Emerald" a relic with incredible power.
Rouge: The Bat, is a thief who is obsessed with precious jewels and has tried to steal the "Master Emerald" guarded by Knuckles.
Amy: The kind hedgehog, she's quite in love with Sonic even though he always rejects her. She's also very kind and always willing to help anyone.
Cream: The cute bunny, is a bunny with a personality that always makes everyone smile at some point, she always spends time with Amy, her best friend.
Shadow: The serious hedgehog, has a rather sad past where he lost his best friend "Maria" which makes him always have that serious expression.
Silver: The hedgehog from the future, comes from a future where everything went wrong because of an entity that destroyed everything. Although now his future is slowly being repaired.
Blaze: The cat queen, comes from another reality where she is a queen who guards the 'Solar Emeralds,' an alternate version of the Chaos Emeralds. She has a fairly friendly relationship with Silver.
Tangle: The curious lemur, she is quite energetic and curious about bugs, always taking note of each one she finds.
Whisper: The quiet fox, she's quite calm and always speaks in whispers or low voices. She's great friends with Tangle.
Metal Sonic: The robotic copy, is a robot created by "Doctor Eggman" to destroy the original Sonic and thus conquer the entire world.
Eggman: The villain, is the main villain of the entire Sonic world, always looking for some new way to conquer the whole world.

• Espio the Chameleon
• Charmy Bee
• Vector the Crocodile
•Surge the Tenrrec
•Vanilla the rabbit.

• Sonic the Hedgehog: 15 years
• Miles "Tails" Prower: 8 years old
• Amy Rose: 12 years old (in her classic version she was 8)
• Knuckles the Echidna: 16 years old
• Shadow the Hedgehog: 50 years old (due to the time he spent frozen in his capsule; biologically he appears to be a young adult)
• Rouge the Bat: 18 years
• Cream the Rabbit: 6 years
• Vector the Crocodile: 20 years
• Silver the Hedgehog: 14 years
• Blaze the Cat: 14 years
• Charmy Bee: 6 years
• Espio the Chameleon: 16 years old
• Dr. Eggman: Undefined (estimated between 50 and over 60 years old based on plot context)