Who is Sonic the Hedgehog

Sonic the Hedgehog is a fictional character created by Sega in 1991. He was created to be Sega's mascot. Originally, he stared in many video games, but later moved to television and other media.
Sonic has the appearance of a streamlined hedgehog with shoes and gloves, as well as the ability to stand on his hind legs and run faster than the speed of sound. He also has control over Chaos Emeralds, seven special jewels which give special powers on the Planet Mobius.
In the first few games, Sonic was rounder and more childlike in appearance. Since 1998, he has been a lot slimmer and has longer features as well as green eyes.
Personality-wise, Sonic is a hero at heart. He cares for other people and is often described as free-spirited, adventurous and wild. Sonic tends to be stubborn and hasty, which together with his unshakable confidence is dangerous--but he always looks after his friends.
Lastly, when the seven Chaos Emeralds are with him, Sonic may change into Super Sonic. His spikes curve upwards and his body turns yellow-gold. In this state his powers are immense.
Sonic Is an animated Hedgehog that runs around really fast with his friends who are other animals such as a fox, a chinchilla, a bat, and other animals. They are all trying to defeat the evil Dr. Eggman.
Sonic is a blue Anthromorphic hedgehog hero who is known by his lightning speed. Created in 1991 coming out in his first game 'sonic the hedgehog', he has been the replacement mascot of SEGA's yellow kid, and he's been in games ever since.