>>40451
I don't think that's utilizing the crossover element as effectively as it could. If you want to do a zombie story, they could just do a zombie story. But as you mentioned, the Metal Virus saga was largely that. To bring back actual dead characters would be a bit of a twist, but there aren't that many of those, and frankly, to bring them back would probably just be in bad taste. Which characters are actually dead? Gamma, Maria, and Gerald, I suppose. Maybe you could bring Gerald back and have him be a big villain who is scarier than Eggman, but would it really be that different from his story in Sonic Adventure 2? Maybe.
But bringing back Gamma and Maria would be like when DC brought back the original Superman and Lois Lane as Black Lanterns. It's just in bad taste. But at least there it wasn't the whole story, they were two of zillions of zombies. In Sonic, if you brought back Maria, that would have to be the main thrust of the story. Gamma I suppose isn't even technically dead and could come back, but as a zombie? That would be dumb. Also there's already Chaos Gamma from Sonic Battle.
So that leaves the Echidnas. But to bring them back as zombies would be stupid because only two of them even have names, and to have them as zombies, stripping them of their personality, wouldn't be that interesting. I guess Tikal is still around as a ghost, and using her also as a zombie would be confusing and maybe you could do stuff with that, but at this point I think it's just getting silly.
But okay, you have the whole echidna society that could come back, and that would tug at Knuckles' emotions. But is this functionally very different from The Dark Brotherhood (which is functionally not very different from The Dark Legion, which is functionally not very different from the time they fought some Echidnas in that one French graphic novel)?
I guess Starline is dead. They could use him. They might do that anyway. But as a zombie he wouldn't be threatening because it's his mind that makes him threatening. So yeah, you'd have to go to the Archie comics to have a bunch of dead characters to use. But those characters suck. Nobody wants to see Tommy Turtle come back, even as a zombie.