Sonic and Neo Metal by Kyrogeki -- Fur Affinity [dot] net

He has the gold form in the Archie comics. It happens when he uses Chaos Emeralds I think.

72140 - safe, artist:huper123gui, artist:theenigmamachine, collaboration, metal sonic (sonic), neo metal sonic (sonic), sonic the hedgehog (sonic), fictional species, hedgehog, mammal, robot, sega, sonic heroes, sonic the hedgehog (series), 16:9, 2017, arm

Fem Neo Metal Sonic by Caelpio -- Fur Affinity [dot] net

Favorites Gallery for Sexyhedgehog777 -- Fur Affinity [dot] net

Artwork Gallery for Kyrogeki -- Fur Affinity [dot] net

Taking a break]💚Neo Metal sonic💚○KindRobot○#CNS

FanArt::Neo Metal Sonic by sitinuramjah -- Fur Affinity [dot] net

Neo Metal Sonic by sfmff2 -- Fur Affinity [dot] net

Neo Metal Sonic Disguise Doodles by CosmicSynthetics -- Fur Affinity [dot] net

Favorites Gallery for Mephiles37 -- Fur Affinity [dot] net

Neo Metal Sonic by Fox_Gungrave -- Fur Affinity [dot] net