Sonic The Hedgehog is a main character and the titular character of the show SONIC The Hedgehog.
Sonic is rather naive, and generally assumes people aren't evil until their motives are discovered. Sonic can be somewhat sarcastic, and is also a bit sassy, but he's generally quite kind, and puts those in danger first, going as far as risking his life to save them. He enjoys making allies and fighting monsters and robots with his friends, and is considered a good leader. He's usually open to others' ideas and opinions, and, if given the opportunity, will try to convert anyone from evil to good.
Sonic was born in the year 2039 in Northwestern Christmas Island, Mobius. Sonic's ability to run faster than the speed of sound was discovered at age 6, when his mom had a playful race with him in his backyard. Sonic won in about 5 seconds, and stopped exactly 3 inches after the "finish line". Sonic was also quick to learn how to walk, learning how at 6 months old. At age 10, Sonic single-handedly stopped a school bully from punching a younger student by using the Homing Attack on him, getting praised as a hero. On his 13th Birthday, he was given special shoes that allowed him to grind on rails. When he went to try them out, he ran into Miles "Tails" Prower and Knuckles The Echidna. Tails taught him how to spin dash, and Knuckles taught Sonic how to fight using hand-to-hand combat. The three bonded and became Team Sonic, a group dedicated to helping the people of Mobius out. Once Mobius was destroyed by Dr. Eggman, Sonic, along with Tails and Knuckles dedicated their lives to finding the rest of Mobius's residents, as well as protecting Earth.
Asides from his ability to run at the speed of sound, Sonic also knows how to use the Homing Attack, a move that allows the user to charge forward at any desired target while leaving a trail of color behind, The Spin Dash, which allows the user to roll at high speeds to destroy enemies, The Tornado Jump, which allows the user to suck enemies into a tornado and toss them up into the air, and the Super Peel-out, which requires an immense amount of concentration (to an almost painful amount), but allows the user to run at the speed of light, granting temporary invincibility.
Sonic's weaknesses are his inability to swim, his lack of control during a Super Peel-out, and sometimes, his kindness.