Sonic is a blue hedgehog who is the mascot for the video game company known as SEGA. He can run faster than the speed of sound, hence his name. He is good friends with Winnie the Pooh and his friends. His arch enemy is Dr. Eggman, also known as Dr. Robotnik. His best friend is a two-tailed fox named Tails.
- Sonic met Winnie the Pooh in Winnie the Pooh Meets Sonic the Hedgehog, where he battled Metal Sonic, his robot counterpart made by Dr. Eggman.
- Sonic is an old friend of the Good Fairy, as she is the one who gave Sonic the gift of his trademark speed.
- He has a cousin named Seichii the Hedgehog.
- Sonic, along with Tails, Knuckles, Amy, and Shadow, will join Pooh and friends as one of the Emerald Seachers in Pooh's Adventures Armada: Hunt for the Chaos Emeralds.
- Sonic, along with Tails, Knuckles, Amy, Cream and Cheese, will be revealed to be an old friend of Kyle in The FT Squad's Adventures Series.
- Sonic along with the others are good friends to Team Robot & will join them in Emerl's Adventures Of Power Rangers Super Megaforce.
- Sonic will make his first appearance in Tino Tonitini and the Legends of Oz: Dorothy's Return.
- Sonic starts his own adventure series in Sonic Storm Adventures of Kingdom Hearts.