Sonic the Hedgehog © Sega, Sonic Team
Oh, I remember the Artificial Chaos.
They actually sort of creeped me out in Shadow the Hedgehog though, when it was shown that they aren't just robots, but some sort of synthetic lifeforms created as part of Gerald's research, and most of them went rogue. I wonder if they were meant to be some sort of biologic weapons for the Black Arms to use, considering how in the modern parts of Shadow the Hedgehog, they were later taken into the Black Arms.
So, who's next? Biolizard?