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Although I'm more a fan of the old classic Gaurdians of the galaxy(Martinex,Yondu..) I do think I'll like how these guys look on the big screen.
Groot though of the new GotG is an interesting character.
As far as Ultron with Ultron comes Hank Pym which will be an awesome story line to add to the movie series. I'm guessing of course the Antman movie will kick this off.