Sonic Movie Sprites by expungonal on Sketchers United

Pixilart - Sonic Sprites by Sonic-Gamer

Custom / Edited - Sonic the Hedgehog Customs - Sonic (Sonic 2-Style, Expanded) - The Spriters Resource

Dorkly sonic sprite rigged Blank Template - Imgflip

Custom / Edited - Sonic the Hedgehog Customs - Sonic (Sonic 1 Beta-Style) - The Spriters Resource

Custom Sonic Sprites (Original Palette) by MylesDeGreat on DeviantArt

Sonic The Hedgehog - No chance to win against this one.

Pixilart - Sonic sprites by tailsALT

Sonic Sprites v1 (WIP) by AxelFlox on DeviantArt

Ralorche — Some more Saturn-esque Sonic sprites.

ArtStation - Sonic The Hedgehog 2: Alternate Sprites