Main Characters

Captain America is the leader of the Avengers. He is a very morally correct man who always does the right thing. He cares deeply about his team and all people of the world and so would do anything to save them.

Iron Man is "the brains of the operation". He creates all the technology, including Ultron. He however redeems himself by creating a new "robot", with assistance, who is good and helps turn the tide to defeat Ultron.

Ultron is the main antagonist in the film. He was created by Iron Man to protect humanity. However, he has a warped perception of what is right so he instead tried to wipe out all humans with his robot army.