I think the RP is what triggered the bitter!Sonic pieces last night. Y'see, I had this thought in my head, but it remained inert until
eggmanbenedict wondered internet-aloud if what was controlling Knuckles jumped to someone else. My mind jumped to possessed!Sonic, because my Sonic at least has a rampaging hate-on for GUN, so I can only imagine the chaos that would ensue. And then, bam. Fic.
And I was thinking, evil!Sonic would be a scary son of a bitch. A scary son of a bitch that I'd still probably want to hug. He's charismatic. He's strong. He's
damned smart, even if he doesn't stop to think very often. And most of all, he's got good guy cred. No one would believe he had turned until it was very likely too late. And, if the change was triggered by, say,
the death of Tails and Knuckles, it'd be incredibly hard, perhaps impossible, to change his mind. Not that it would be easy if they were still alive.
I'd also see him still trying to protect his friends and innocent bystanders, but his reason now is that they're not the target of his rage, and therefore shouldn't have to suffer.
And crap, now I really want to write that damned future fic. Oh, it would be a thing of beauty...