Metal Knuckles by SRB2-Blade on DeviantArt

Metal Sonic MKIII - (Sonic VAM Character Concept) by dannythecool123 on DeviantArt

Metallix mk 3 - Knuckles by TheStiv on DeviantArt

Steam Workshop::Cole's Downloaded Rivals Stuff 2

Metal Sonic Lineart by SRB2-Blade on DeviantArt

Metal Knuckles by cyberill on DeviantArt

Metal Sonic Battle by KannaTC on DeviantArt

Mecha Knuckles by OhYeahCartoonsFan on DeviantArt

Classic Metal Sonic by Tails19950 on DeviantArt

Open Assets] - Metal Knuckles