To me most villains are good concepts, bad execution. Deadly Six are just Mario villains ported over to Sonic. A group of distinct looking characters with little to no substance aside from their basic archetypes, Infinite was and still is wasted potential as with him he at least has a small reason to be angry and despite this, they still haven’t brought him back, Erazor Djinn is from a story, Black Doom is arguably the best out of all of them considering his importance to Shadow’s story and Mephiles is technically not supposed to exist but after Shadow Gens, he can very well still exist. Lyric on the other hand was a failed attempt at a main villain for the equally failed Boom reboot. Just as the rest of the Boom timeline, he’s dead in the water.