Gender: boy. Species: an anthropomorphic black hedgehog known as the "Ultimate Life Form". Appearance: Shadow features sleek black fur with bright red stripes on his quills, arms, and legs. He has striking red eyes, a tan muzzle, and a distinct patch of white chest fur. He wears white gloves and specialized air-powered hover shoes, which generate jet streams. Personality & Background: Shadow was infused with the DNA of an alien warlord named Black Doom. He was originally built with the intention of finding a cure for a terminally ill young girl named Maria Robotnik. When a military organization (G.U.N.) raided the colony and killed Maria, the trauma made him more rude. Abilities: Shadow is essentially an unstoppable, ageless living weapon. Chaos Control: His utilizing Chaos Emeralds to warp time and space, allowing him to teleport.

Gender: boy. Height: 4'1 Personality: kind, playful, lots of energy. Fears: thunderstorms. Appearance: An amber/orange-yellow fox with white fur on his chest and muzzle, cyan eyes, and twin tails. Flight: He can spin his two tails together like a helicopter rotor to fly. Mechanical Prowess: He he's an inventor for gadgets. Best friends with Sonic.

Amy is a pink-furred, anthropomorphic hedgehog with a peach muzzle, peach arms, and green eyes. Unlike other male hedgehogs in the series, her pink spines are softer and worn down into a shape resembling a bob cut. Her attire typically features a red sleeveless dress with white trim, a matching red headband, white wrist-length gloves with gold ring cuffs, and tall red boots with a white vertical stripe. Personality: kind, sweet, sometimes bossy.

Species: Mobian short-beaked echidna Color: Red fur with a white, crescent-shaped patch on his chestTraits: Seven dreadlock-like spines, a tri-crooked tail, and amethyst eyes. Attire: Signature large, white boxing-style gloves with two spiked knuckles on each hand, alongside red and yellow boots with green cuffs. Personality & Role: Knuckles is the last living member of the ancient Knuckles Clan and the sole guardian of Angel Island's Master Emerald. He is serious, honorable, and sometimes kind, but barely. Abilities Super Strength: Powerful enough to shatter boulders and effortlessly destroy giant robots. Loves eating grapes.

Physical Traits: He is comically stout and egg-shaped, typically wearing a red and yellow jacket, black pants with high boots, and round sunglasses. Personality and Traits The Mad Genius: As a certifiable mechanical mastermind, Eggman is incredibly arrogant but fiercely intelligent. Wants to make Sonic his experiment.