Board Thread:Speculation, Theories, and Rumors/@comment-25912037-20141223043619/@comment-24658561-20150519190414

Judging by the older Archie Comics(considering only the main cast), I'd say it's Knuckles. He can lift entire factories, has a Chaos form and he is the guardian of Angel Island, in the comics that's some sort of Jesus, I guess(didn't read every issue). Heck, there's even an alternate future where he turns evil, kills everyone and makes them his slaves(including Shadow, you see him as a Prelate). And he has a girlfriend. CAN'T DO THAT, SHADOW! YOU ONLY HAVE CRAPPY OCs! >:D

But looking only at the games... I think it really would be Shadow, because he's become very marysue-ish with his Dragonball powers. SEGA really did to much fanservice on him... But hey, he's Ultimate Lifeform.