Who is the most evil Sonic character?

Ah, now we're diving into a heated debate in the world of Sonic the Hedgehog fandom! Let me pose the question in a thought-provoking manner: Among the vast cast of characters that populate the Sonic universe, who emerges as the epitome of villainy, leaving fans scratching their heads and hearts racing with both fear and fascination? Is it the conniving Dr. Eggman, mastermind of endless schemes to conquer the world with his robotic minions? Or could it be one of the darker entities that have emerged from the depths of Sonic's multiverse, weaving webs of deceit and destruction? Join me in exploring this contentious question, as we delve into the psyche of those deemed the most evil by the passionate Sonic community.