The main hero of the Sonic the Hedgehog franchise. Sonic is a blue-colored hedgehog who can run at extremely fast speeds, and has a upbeat personality while always looking forward. He makes friends easily, but will equally not forgive anyone who threatens his friends and world. His long-time nemesis is Dr. Eggman, but they seem to uphold their rivalry on decent terms.
Sonic was designed and created by Japanese game designer Oshima Naoto . He was initially codenamed "Mr. Needlemouse" during development as Sega's new mascot and was originally colored teal. His trademark blue pigmentation was chosen later to match Sega's cobalt blue logo.
source: danbooru wiki