Hacks - SHADOW In Sonic 1 (Original Levels) TRaiNoR

Hacks - SoNiC & SHADOW Double jump 2 by TRaiNoR

Custom / Edited - Sonic the Hedgehog Customs - Shadow (NES-Style) - The Spriters Resource

I know people take issue with IDW Shadow, but the comics really do right by so many characters (some spoilers for the comics included) : r/SonicTheHedgehog

List of Sonic the Hedgehog characters - Wikipedia

Why Rouge is in Sonic Dream Team (& Sonic Prime) : r/SonicTheHedgehog

Sonic the Hedgehog/History and appearances (IDW), Sonic Wiki Zone

Shadow Adventure - Sonic Retro

Games - Sonic the Hedgehog 2

Sonic The Hedgehog Archives Volume 5 Review

Shadow in Sonic the hedgehog (TRaiNoR) ✪ Sonic Hack Playthrough

Shadow in Sonic 1 v1.1 (S1 Hack) : Free Download, Borrow, and Streaming : Internet Archive

Ultra Ego Shadow in Sonic 1 ✪ Sonic Hack Longplay