Mecha Sonic (Sonic 2 GG) by MarcosVargas on DeviantArt

Sonic Vs Mecha Sonic by Deamondante -- Fur Affinity [dot] net

Steam Workshop::Mecha Sonic

Mecha Sonic Revamp [BETA]

Mecha Sonic II by RavenBlitz -- Fur Affinity [dot] net

Mecha Madness: Favorite Mecha Sonic - Sonic Chat - Sonic Stadium

Mecha Sonic in Sonic 3 [Sonic 3 A.I.R.] [Mods]

Mecha Sonic Sprite Sheet by TheKnucklesMainG4 on DeviantArt

Mecha Sonic (Sonic 2), The Codex Wiki

Mecha Sonic (Sonic 2) by AnxiousAlex2004 on DeviantArt

In Sonic 2 (8-bit), Mecha Sonic was designed so that its height matched Sonic's. In Mania, it still has that very same height: 32 pixels. : r/SonicTheHedgehog