Iron Man

Of course, as the flagship hero of the franchise – and as the leader of one of the two teams fighting in Captain America: Civil War – there’s every chance that Tony Stark, aka Iron Man, could land the decisive blow in this movie.
He has been the key to victory in pretty much all of his appearances to date – most notably in the Battle of New York in The Avengers – and his fans would be disappointed if that didn’t turn out to be the case this time around.
In all honesty, his team far outmatches Captain America’s in Captain America: Civil War, and he could easily lead them to victory, land the finishing blow, and maintain his status as the main man in the Marvel Cinematic Universe.
Of course, the titular character has a great chance of landing the decisive blow in the battle, as well.
