All we know so far as far as it goes for the Villains of The Amazing Spider-man 2 is, Electro, Rhino, and possibly Green Goblin according to the poster below,
Now i don't know how things will turn out, i don't think Electro will die and it will begin a lot of thing, and its not even confirmed if Dane DeHaan but if he does, And doesn't die either. This is what i'd what love to see.
AMAZING SPIDER-MAN 3 & 4 FAN-CAST BELOW. (comment thoughts)
Origin of Cletus Kassidy and into Carnage
I would love if he played Cletus Kassidy although Jim Carrey is rumored for the role, but this guy is pretty damn good at playing a psycho, and that's exactly what Cletus is.
CASEY AFFLECK (as) Roderick Kingsley
Now your probably thinking, Casey Affleck as Roderick? but i could really see him pulling it off, and if you've seen 'The Assassination of Jesse James' He can kind of play slightly weird, but then also from different movies a good guy, so he could easily do it!
LOGAN MARSHELL (as) Eddie Brock and into Venom later on.
Now, Eddie Brock is supposed to be the same age and going to high-school with Peter. but they are kind of doing that with Harry in this filma nd it would be weird, so maybe he can be a little older and works for Oscorp? and i think it could be sick!
DANE DEHAAN (as) more crazy - bough - weird - Goblin!
THE VULTURE? PLEASE BE THE VULTURE!
Honestly, he'll be a waist if he's not The Vulture! haha.
SO THAT'S IT.
And i would love to see that cast come together for TASM 3 (or) 4!