His favorite food is Chili-Dogs.
In AOST show, he appears in the episode "Robo-Boxers Revenge", which this video have been deleted for some reason.
In Sonic 1, the first game ever, Eggman (known as Dr. Ivo Robotnik) has stole emeralds and animals and he put animals inside his own robots and capsules (they only appear if you defeated a boss), Sonic will save animals and destroy the robots that Eggman has made, he runs from the very easy Green Hill Zone, to the Eggman's base, Scrap Brain Zone.
In Sonic 2, he has got a sidekick/friend named Miles Prower (friends just call him Tails), and they both go in the Adventure to save the animals and destroy Dr. Eggman.
In Sonic 3, on the opening of the game, Sonic jumps off the plane and becomes Super-form, and they have landed on the Angel Island, but then, Knuckles The Echidna punches Sonic and took the 7 chaos emeralds then runs away, Sonic and Tails will go through Acts and Special Stages and crush Eggman again, because he just stole animals again and make Knuckles the enemy of the both heroes. But now, Eggman is defeated, Knuckles becomes the member of Sonic Team.
- Miles "Tails" Prower - his sidekick, helps him to complete as many acts. For some reason he goes slow and crashing into some hazards, the reason is because Tails was a bot in the games.
- Knuckles The Echidna - the red echidna, with spiky gloves, is Sonic's friend. He can glide, punch and climb.
- Amy Rose - she loves Sonic, but Sonic doesn't want to be her girlfriend. She also has the Picko Hammer.
- Silver the Hedgehog - the silver hedgehog, that can use his physical powers to blast through the hazards and stuff that blocks his way.
- Manic the hedgehog - his brother, appears on Sonic Underground only. He got drums.
- Sonia the hedgehog - his sister, also appears on Sonic Underground, and she has got the pink keyboard.
- Dr. Eggman - the evil genius, that builds the hazards and robots to block Sonic's way and harm him. He's also known as Ivo Robotnik
- Shadow the hedgehog - Sonic's rival. He can use the chaos powers like Chaos Control, Chaos Blast and Chaos Spear. He appears as a rival, chasing Sonic and battling with him, and Sonic must win him.
- Gemerl - the copy of Emerl. He is black robot with yellow parts on his body, he appears on Sonic Advance 3 as an enemy.
- Metal Sonic - Sonic's Metal clone created by Dr. Eggman.
- Super Sonic 2
- Super Sonic 3
- Super Sonic 4
- Sonic is afraid of water and he can't swim
- In the Series of Adventures of Sonic Toys, he wears the camofluaged coat without sleeves, sometimes not.
- Many fans love Sonic but others loves Mario, and they think that Sonic is bad or something like that, and sometimes the Sonic fans vs Sonic haters starting a flame war on the Internet.