Concept art featuring chick as for one of choices for Sega's new mascot.

Concept art featuring porcupine as for one of choices for Sega's new mascot.

Concept art featuring cartoonish kid as for one of choices for Sega's new mascot.

One of concept arts including new mascot choice for Sega.

A rabbit design, showing what Sonic could have looked like, from The History of Sonic the Hedgehog.

Early Concept Art.

Early concept art.

Early concept art.

Another early design of Sonic, possibly the final design, from The History of Sonic the Hedgehog.

Sonic the Hedgehog (1991) concept art.

Sonic the Hedgehog (1991) concept art.

Concept Art.

Concept for Sonic 2.

Art Used for Sonic CD's Animation.

Sonic CD Sketches.

Sketch for Sonic CD.

Concepts for Shields.

Sonic with Ring concept from Sonic the Hedgehog (TV Series).

Concept from Sonic Jam.

Concept from Sonic Jam.

Concept from Sonic Jam.

Concept from Sonic Jam.

Concepts for Sonic Adventure's Sonic Redesign.

Concept art from Sonic Adventure.

Concept art from Sonic Adventure.

Sonic Heroes Sketch.

Concept for Sonic's Attacks in Sonic Heroes.

Concept for Sonic's Attacks in Sonic Heroes

Early Concept of Sonic, Tails and Amy from Sonic Riders showing in full clothing.

Sonic the Hedgehog (2006) concept art.

Model (modern) for Sonic Generations

Model of Modern Sonic with eyes open.

Any early image that was not used as promotion.

Concept with NiGHTS.

A concept for Sonic's fondness for Chili Dogs.

A concept for Sonic's Spin Jump.

A concept of the current Gimmicks.

Final Promotional Concept used on goods.

Concept for Sonic 3.

More Concepts.

A old Anime Style Concept. Similar to the art of Doraemon.

Sonic Head Dangle Concept.

An early look of Sonic's 2nd Modern Design.

A clearer image of Sonic's pended redesign.

Concepts Arts of Sonic in Sonic Riders

Concept Art Possible Modern Sonic

Old Concept Art

Sonic concept art from Sonic Advance 3 (ripped from Sonic Generations 3DS)