It could develop through shared hardships. With the Civil War tearing the Avengers apart, Pepper and Tony find solace in each other. They become more dependent on one another for emotional support.
One possible storyline could be how Pepper and Tony deal with the political fallout of the Civil War within their marriage. Maybe Pepper has to use her business acumen to protect Stark Industries while Tony is off fighting. Another could be them having a secret wedding during the chaos of the war, and only a few Avengers are aware, which adds an element of mystery and drama.
In many fanfictions, their relationship develops through mutual understanding. They both have a past filled with pain and secrets. For example, Bucky's history as the Winter Soldier and Natasha's past as a spy. As they face the chaos of the Civil War, they start to see that they can rely on each other. Their relationship might begin with a bit of suspicion, but as they work together to survive and figure out what's really going on, it deepens into a strong bond.
Often, their relationship is tested. Tony's involvement in the Civil War can cause stress between them. Pepper might worry about his safety and the moral implications of his actions.
One great 'Avengers Civil War' Spiderman fanfic is 'The Web of Choices'. It delves into how Spiderman has to make difficult decisions during the events of the Civil War. Another one is 'Spiderman's Struggle'. It focuses on his inner conflict as he's caught between the two sides.
Naruto's powers could be a game - changer. His ability to create thousands of shadow clones means he could overwhelm the opponents. In a battle - field like the Avengers Civil War, this would be a huge advantage. His Rasengan, a concentrated ball of chakra, could break through strong defenses of the super - powered beings.
There's a fanfic called 'Cap's Stand'. It focuses on how Team Cap was formed. It details the conversations and events that led to the team coming together. It also explores the relationships between the members like Steve and Bucky. It's a good read if you want to understand more about the team from Cap's perspective.
Definitely Iron Man and Captain America. Their conflict was at the heart of the Civil War, so in 'salty civil war avengers fanfic', they often play major roles. Their salty exchanges and complex relationship are always a big draw for fans.
Well, Naruto's powerful jutsu could completely change the dynamics. His shadow clone technique could be used for various strategies. He might side with Captain America as he values friendship and loyalty, just like Naruto values his comrades in Konoha. And his Rasengan could be a very powerful weapon against the opposing side.
At first, their relationship would be very strained. The guilt would make it hard for them to even look at each other. But as time passes, they might start with small gestures. For example, Steve could leave a note for Tony apologizing for some of his actions. Tony, in turn, might respond in a similar way. This could lead to short conversations, which gradually get longer as they start to open up more about their feelings.
To develop characters in a superfamily civil war fanfiction, start with their backstories. For instance, if a character is on one side of the war, explain what led them to that stance. Was it a past betrayal by a family member or a difference in ideology? This will make their actions in the civil war more believable.