<Li> Jeremy Renner as Clint Barton / Hawkeye: An Avenger and master archer who previously worked as an agent for S.H.I.E.L.D. Whedon said that Hawkeye interacts more with the other characters in the film, as opposed to the first film where the character had been "possessed pretty early by a bad guy and had to walk around all scowly ." As the character did not appear in any other of Marvel's Phase Two films, Whedon stated Age of Ultron sheds light on to what the character was doing since the end of The Avengers . Renner described the character as "kind of a loner" and "a team player only' cause he sort of has to be . He's not really a company man . Captain America can be that guy . In (Age of Ultron) you'll understand why (Hawkeye) thinks the way he thinks ." </Li> <Li> Don Cheadle as James "Rhodey" Rhodes / War Machine: An officer in the U.S. Air Force and Tony Stark's close personal friend who operates the War Machine armor . </Li> <Li> Aaron Taylor - Johnson as Pietro Maximoff / Quicksilver: The twin brother of the Scarlet Witch, who can move at superhuman speed . Taylor - Johnson felt Pietro was defined by the fact that he and his sister were abandoned by their family, and they both had to grow up "in Eastern Europe defending and looking out for themselves and each other," that they both look to the other for guidance . Taylor - Johnson also said that Quicksilver was "very overprotective" of Scarlet Witch and has "real anger frustration", which results in him being easily bored because of a short attention span . Feige stated exploring Quicksilver's relationship with his sister and his backstory growing up in Eastern Europe would help differentiate the character from Evan Peters' version in X-Men: Days of Future Past (2014). Taylor - Johnson stated that the running style for Quicksilver went through multiple iterations, saying, "The running style we tested early on was just very one - dimensional and boring to look at, but if you try to do free running, like parkour, then that's very much Captain America's style...You have to find your own place in the stunt world ." Much of Taylor - Johnson's scenes were filmed outdoors to give "life" to his running, as opposed to running indoors in front of a green screen . </Li> <Li> Elizabeth Olsen as Wanda Maximoff / Scarlet Witch: The twin sister of Quicksilver, who can engage in hypnosis and telekinesis . Olsen felt Wanda was "overly stimulated" rather than "mentally insane" because "she has such a vast amount of knowledge that she's unable to learn how to control it . No one taught her how to control it properly...she can connect to this world and parallel worlds at the same time, and parallel times ." Describing her character's mind control powers, Olsen said that the character is able to do more than manipulating someone's mind, with Scarlet Witch able to "feel and see what they feel and see" by projecting visions that they have never seen . Olsen expanded saying, "What I love about her is that, in so many superhero films, emotions are kind of negated a bit, but for her everything that someone else could feel--like their weakest moments--she physically goes through that same experience with them, which is pretty cool ." Olsen drew on her relationship with her older brother and her sisters to prepare for the role, as well as looking to the comics for inspiration . Olsen revealed that Whedon was inspired by dancers as a way to visually represent how the character moves . As such, Olsen mostly trained with a dancer in lieu of traditional stunt training . Olsen is signed for this film and another . </Li>

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