Breaking down the possibilities presented by Marvel's classic android
J.A.R.V.I.S. Made Flesh
Even if the cinematic introduction of the Vision more or less follows Thomas' story beats on the synthetic man's journey to becoming a hero, but that doesn't mean there's no room for change. One of the biggest hints on how Whedon and company's interpretation of the Vision might differ from the comic's is the actor slated to play the role. Paul Bettany has brought Stark's J.A.R.V.I.S. computer system to life in all three "Iron Man" films and "The Avengers." The bodiless personality has been an integral part of the cinematic "Iron Man" mythos, to the point where he's very nearly a full-on supporting character.
Now, picture that voice coming from the body of the mysterious and threatening figure of the Vision. Since the story of Hank Pym is slated to be dealt with in the "Ant-Man" film, separate from and after "Avengers 2" is out of theaters, there has been a great deal of speculation that in the Marvel Cinematic U, it will be Stark that builds Ultron. From there, if the film hops back on to the comic book continuity, it would be Ultron who builds Vision. And while there are any number of ways to approach this development, by using the voice of J.A.R.V.I.S., which has become such an engrained part of the Marvel film mythos, you automatically give the Vision an emotional resonance with fans.