Steve Rogers/Captain America
Of course, Captain America (Chris Evans) is battling – it’s still his film, even though there are more superheroes appearing in this than the actual team up movie, Avengers: Age Of Ultron. The point here is that Captain America has had something of a change of heart since he first appeared in Captain America: The First Avenger. While he was initially depicted as a by-the-book, follow-your-orders kind of guy, this film is where that personality trait does a complete about-face.
It is hardly surprising, considering that his previous franchise outing – Captain America: The Winter Soldier – saw him drawn into battle due to nefarious infiltration of S.H.I.E.L.D. Surely, anyone would be distrustful of authority after a bunch of bad guys, posing as good guys, force you to jump out of a moving elevator. Add to that the fact that the authority he is so wary of is apparently rallying against his best friend, Bucky Barnes, and you have all the makings of a giant conflict.