Sonic is the world's fastest hedgehog, able to go so fast he breaks the sound barrier. He was presumably born on Christmas Island and somehow winded up on another island called South Island before the events of Sonic 1. Any relatives he has are unknown, and his parents believed to be dead. Not that this bothers Sonic much, he grew up pretty normally. Aside from the fact that he runs so fast that he can break the sound barrier. But anyway, one day he was just chilling with his little animal friends when they were kidnapped and put into robots by an evil scientist named Dr. Ivo Robotnik AKA Dr. Eggman. Sonic pursued him to free his friends from the capsules and robots. This was the first of many encounters with Dr. Eggman that would lead him to traveling the world, facing many challenges and meeting new friends.
Sonic was departing from the Space Colony Ark after Sonic Adventure 2 when he, unfortunately for him, was transported unexpectedly on the Island.
Sonic, in personality is like the wind. He's always going places, and never stays in one spot. He's a free-spirit, adventurous, optimistic and can be a little rash. This is mainly because he's very impatient and rushes into things without thinking. He doesn't let anything beat him down and always ends up with a grin on his face. Even in the most dire situations, he keeps his spirit high because he believes he'll be able to make it through any situation if he doesn't run away. He hardly ever acts serious, but when he is he doesn't play around. Sonic can't pass by anyone in trouble or in need, so of course he helps them out, even occasionally a villain. He goes by his own rules and way of life.
Sonic isn't afraid or hates many things. The thing he fears the most is water, mainly because he sinks like a rock in it. He can't swim, and doesn't want to learn, lol silly hedgehog. But that doesn't mean he won't get in water, since he's gone through numerous water stages in the past (and they were a piece of hell, weren't they?) He also hates slow-moving things, because when you can go faster than the sound barrier on foot, everything else just doesn't keep up >:
He also doesn't like seeing people cry. They make him feel bad D: the only thing he actually hates with a passion is any sort of infringement of freedom. HEAR THAT TERRORISTS? He likes being able to live by the rules he's set for himself and running around freely without anyone telling him 'NO U' or anyone else by that matter. He has a big sense of justice, and likes to uphold that. No one messes with the Blue Blur :lb
SPIN ATTACK: Basic curling into a ball attack.
SPIN JUMP: Curling up into a spiky ball of death and jumping.
SPIN DASH: Curling up into a ball, spinning at high speeds, and launching himself at an enemy like a spiky cannonball of death. For Sonic, it's at the speed of sound. Great for mowing down lines of enemies and going distances.
INSTA-SHIELD: While jumping up in the air, Sonic can generate an invincible shield for a second. Good for quick attacks on enemies.
SUPER-PEEL OUT: Also known as the Figure-Eight move, it's an awesome acceleration technique.
HOMING ATTACK: Jumping in the air, homing into somthing and launching himself at a linear angle. Very high impact power.
LIGHT DASH: When a path of rings in place, Sonic can run across them at light speed, usually to get across large paths.
LIGHT SPEED ATTACK: By charging up a spindash with the Ancient Light, Sonic will glow a bright blue, and launch himself at any nearby thing/opponent/person in a blur of blue light.
CHAOS CONTROL: With a Chaos Emerald, Sonic can perform this technique to teleport from one place to another, freeze time, speed it up or slow it down. Only known users aside from him are Shadow, Silver, The Biolizard, Metal Sonic (after absorbing Sonic & Shadow's data), and Eggman (with the use of a special machine)
SONIC WIND: Sonic conjures up winds at high speeds with enough power to slice an opponent unfortunate enough to get caught in it.
FLAME SOMERSAULT: With the Flame Ring attached, a regular somersault becomes engulfed in flames. Can break metal containers and such.
BLUE TORNADO: While jumping, Sonic can quickly follow the path of a perfectly round circle multiple times and make a tornado capturing enemies in it.
SUPER BOOST: Running so fast that his legs don't touch the ground and will gain acceleration faster. Really tiring to do though.
BOUND JUMP: Also known as the Bubble Bounce technique, Sonic can curl up into a ball and slam down onto an enemy. He gains height with each bounce he does.
MAGIC GLOVES: When near an enemy robot, he can capture them into a small ball and chunk them at another robots, killing both at the same time. Nifty!
SUPER TRANSFORMATION: When all seven Chaos Emeralds are gathered, Sonic can turn into Super Sonic. His speed & power increases incredibly, he can fly, becomes invincible and invulnerable.