Peter Parker/Spider-Man
Peter Parker/Spider-Man (Tom Holland) is, essentially, a child – at least, in relation to the other superheroes engaged in this conflict. For this reason, it is almost to be expected that the web-slinger would come down on the side of Iron Man on this issue.
Spider-Man strives for justice, and fights for the people. His universally acknowledged origin story – though, technically, not yet told in the MCU – show us that he is as scarred by the death of his uncle as he is the spider that bit him, and he is determined to prevent others from feeling the pain of such a loss.
These elements make it all the less surprising to see him going against Captain America as that character argues against having more rules imposed. For Spider-Man, it is about regaining order amid the chaos, because that’s where safety lies.
Sharon Carter
She may not be a superhero, but Sharon Carter (Emily VanCamp) will be engaging in plenty of fisticuffs in Captain America: Civil War, if promotional footage is anything to go by. So which side of the fight will she settle on?
As the name, Carter, might suggest, this agent is strongly associated with Captain America. She was introduced in Captain America: The Winter Soldier, as an undercover agent posing as his neighbour while assigned to protect him. She was also seen in the S.H.I.E.L.D building in that movie, taking a stand against Hydra when their dastardly plan to attack was revealed. At that point, she defiantly showed her allegiance to Cap, who was trying to save S.H.I.E.L.D.
In Captain America: Civil War, however, Cap is taking a stand against authority – including that which employs Sharon Carter. Torn between the two, the optimistic hope would be that she fights for Cap once again. Not everything is the MCU is optimistic, however, and Sharon Carter could well surprise us.