Who is the darkest Sonic character?

Well, Sonic the Hedgehog is known for his speedy adventures and bright, colorful world. But when it comes to darker characters within the franchise, there are a few contenders that could be considered. So, who is the darkest Sonic character? Is it the mysterious and enigmatic Shadow the Hedgehog, who has a tragic past and a penchant for violence? Or perhaps it's the sinister Dr. Eggman, the series' arch-nemesis who is always scheming and plotting his next move? There are also other characters who could be considered dark, such as the mysterious Black Doom or the malevolent Metal Sonic. But ultimately, it's up to the individual fan to decide who they believe is the darkest character in the Sonic universe. So, who do you think it is?