1. Black Widow
To me, this just makes sense. Of the main characters in The Avengers without powers or an awesome suit, she is easily the most likable, and is sure to become more so given her co-starring role in Captain America: The Winter Soldier. We can expect to know a very different Natasha Romanoff by the time Age of Ultron rolls around and, if rumours are best believed, she might even have a little something going on with Cap himself. In the tradition of tragedy, lovers are constantly torn apart by death and destruction, so what better motivation for Cap than Black Widow being killed ahead of the final battle against Ultron? Black Widow is, really, the perfect character to kill off; she's not major enough that she will risk offending too many audience members, but she's also likable, interesting, and played by a famous enough actress to give it a real impact in this world. This is where the safe money sits, in my opinion.
Chance Of It Happening: 7/10 Who do you think, if anyone, Joss Whedon will kill off in The Avengers: Age of Ultron? Let us know in the comments below.