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.
who is the fast guy in avengers age of ultron
Pietro Maximoff / Quicksilver