User blog comment:Xandermcc/Next Crossover Theory/@comment-1330227-20170709190041/@comment-1330227-20170710183752

Earth-52 could be a good one.

I would go with Johnny Quick for this storyline over Godspeed because I think Godspeed would be better used as a season long villain in season 5 or 6 (depending on how soon they want to go back to a speed villain). It would be a waste to use Godspeed just in the crossover, especially as part of a team. Johnny Quick would be a better candidate for a Forever Evil crossover storyline because he wouldn't be a season long villain type and would be good for a short, four episode storyline where he is part of a team of villains.

Well, it would be more of Black Siren joins them at the end of part 1 or beginning on part 2, while they're on earth. You can make it very personal without just dark versions of our heroes. Robert would be a good choice opposite Oliver because there would be that emotional element of he is his father (kind of like Kara going against Astra in season 1 of Supergirl). It would just be like with Owlman in the Forever Evil storyline in the comics.

Wonder Woman's doppelganger is actually Superwoman. The idea with Ultrawoman is basically having it be the female version of Ultraman and be a counterpart for Kara. However, after reading your description for Ultra-Girl, I actually kind of like the use of her for this story. The use of a White Martian would be as a counterpart for J'onn.

But if it's the ghost of Ronnie that found Jax as a host body, wouldn't it be the face of Jax, not Ronnie? My way, it's Ronnie's body and it's mostly the same as Earth-1 except that Ronnie survives instead of Martin and merges with Henry instead of Jax, which then explains him turning evil as he has Henry in his head. I know about Atomica in the comic. I just think an evil Ray would be a better choice for the Arrowverse as the Ray they have developed in the shows would be more affected facing an evil version of himself. You're version doesn't really give much of a counterpart for Ray.

Barry has already faced an evil version of himself, Oliver has been facing his inner demons to a point where an evil version of his father would be a better villain in this storyline.