Which villains should be in The Amazing Spider-man 2

I did a previous blog about whom I think could possibly appear in the sequel for The Amazing Spider-man movie, but this was way before I saw the movie. Here is my list of whom I think should NOW appear in the sequel.
SPOILER ALERT... THIS IS NOT A DRILL 
At the end of The Amazing Spider-man a mysterious figure appears in the shadows of Curt Connors cell asking if he told Peter about his father. This character appears and disappears when thunder occurs. Here are a couple of people I think this may be...


MYSTERIO


Quite a few characters in the Marvel Universe can jump from place to place and among the few is Spider-man villain Mysterio. The original Mysterio was named Quentin Blake. Quentin Blake was a stuntman and special effects expert. Using his skills (and his fishbowl helmet), he then turned to a life of crime and messed with everyone's mind including Spidey.
Mysterio was due to appear in one of Sam Raimi's Spider-man films and was to be played by Bruce Campbell. This movie will obviously never see the light of day. 
I think that Mysterio would make a good villain as he would be able to mess with Peters mind like he does in the comics.
What if Mysterio were to find out who Spidey was? He would be able to play with his mind, for example: making Peter believe that Uncle Ben was still alive or even his parents!


Marc Webb is trying to make this version much more grounded and realistic and I do wonder how they would be able to include Mysterio in this down to Earth version.


ELECTRO


 Electro AKA Max Dillon is the master of electricity and can either release or absorb the electricity.
In the Ultimate Universe, Electro is Norman Osborn's right-hand man and has a better fashion sense than Earth 616's Electro. This version of Electro is a result of genetic mutation from none other than Justin Hammer who appears in Iron man 2.
Electro's powers are a little more down to Earth and would possibly make a rather interesting threat to Spider-man.
In the movie, the mysterious character who appears in Connors cell, appears and disappears whenever thunder occurs and we all know that Electro can travel through electricity... Do the math.


CHAMELEON

Chameleon also known as Dmitri Anatoly Nikolayevich Smerdyakov Kravinoff is the master of disguise. He can take the appearance of almost anyone and can also be a certain threat to Spidey like Mysterio would be to Web head. He could mess with his head in making him think that close ones who had died are actually alive. 

If this version is to be the Ultimate version then it wouldn't be very down to Earth and realistic. The Chameleon in the Ultimate version has the ability to shape-shift whereas in the Earth 616 version he wears masks and just tries as hard as he can to act his role.

Although in the movie, the character seemed to emerge and disappear whenever there is thunder and I highly doubt that Chameleon can do this.

VENOM

We mostly know Venom as being Eddie Brock, but Eddie Brock is only the host of an extraterrestrial being known as a Symbiote. Therefor anyone could be the host for the alien.

In the Ultimate Universe the Symbiote was actually created by Richard Parker (Peter Parker's father) and Eddie Brock's father to cure cancer. This creation did succeed but it also took over your body and mind and creates pure Venom. A decade later Peter finds this creation and puts it on! We can all imagine what happened then. Due to Peter's willpower, he manages to release himself. Eddie Brock then finds it and puts it on; this is where he becomes Venom.

For those who have watched the film, can see that the character in the shadow is wearing a bowler hat and I doubt that this would be in Venom's wardrobe.

Also, Venom is among the few that can appear and disappear with ease.

Another thing is that when Dr. Rajit Ratha was talking to Dr. Curt Connors he says "Richard Parker wore the suit very well". Some people like myself would say that, that may be hinting to the Symbiotic suit which Richard Parker created. Others may think that it may just mean that he was at a higher status compared to Connors.

NORMAN OSBORN

Norman Osborn also known as... THE GREEN GOBLIN, is one of Spidey's most dangerous foes. A reason for this is that he knows who Spidey really is! 

In the film it's mentioned several times that Osborn is ill and that he needs Connors formula. Even though he is never seen, we can all see and hear things about him. For example Oscorp industries which is Osborn's company. 

Norman uses the OZ formula to turn into The Green Goblin, this initially turns him mad and increases his strength, agility, reflexes and stamina. He uses many weapons going from Pumpkin bombs to his glider.

I think that in the film, they will use the OZ to cure him, but this will also make him mad and gain all the powers of the Green Goblin in the comics.

I don't know how Osborn would be able to move from place to place, but my initial thought is that he sent someone to see Connors in his cell.