Scarlett Witch-Vision Relationship:
In the full-length trailer, Marvel Studios revealed the entire line-up of Team Captain America and Team Iron-Man. The first question that will come to your mind: Is it even a fair game? How Can Team Cap fight the Vision? Vision is literally god with a vibranium-laced body and a synthetic soul. He was programmed by Tony Stark and Bruce Banner using J.A.R.V.I.S codes, activated by the mind gem hidden inside the Loki Scepter. He is not really an AI, he is more a Cybernetic creature who yearns to be more human. He would prefer to be more man than machine.
The only one in Team Cap who is capable of controlling him is Scarlett Witch. In comic-book universe, she has an intimate relationship with Vision and even had two kids. But in the movie-world, for the two of them to end up in opposite camps, firstly a long time has been passed since Avengers 2 and secondly, something drastic must have taken place between them. Elizabeth Olsen told the entertainment correspondent – “I think there is something unique in the fact that her powers come from the same things that power him. That’s how we have made them specifically in common. As opposed to comics which has created a pure romance”. She is talking about the mind gem which is the source, she feels connected to him in a way that Vision is new to this world, unaware of what suffering is and could provide emotional solace to her who has just lost her brother.
In the words of Ultron, Scarlett Witch can tear Team Ironman apart from the inside. In the Avengers disassembled storyline of Marvel comics, Scarlett Witch took control of the Vision’s body, rips it apart and then re-assembled it.