GaiaKoraidon
What if Black Doom was successful in his mission?
In a twist of fate, Shadow's genes become altered from being fatally injured during his battle against Devil Doom in his own White Space once the Sonics confront the Eggmen and Time Eater, restoring the timeline to how it was. Now in hiding from everyone(Sonic included), Shadow must cope with his new alien form along with some transferred over Doom powers...all while trying to control something deadly inside that could be deadlier than Black Doom himself.
The Black Arms Shadow AU formerly known as Monster Inside Me gets revived into A Hero's Two Sides, and I'm proud to finally bring this concept back with the release of Sonic X Shadow Generations, which the revisited project is now a twist on. Fair warning: there will be spoilers to the game mentioned, so I would suggest playing this peak masterpiece before reading; also including OCs belonging to @B-3NtheHedgehog.