One of the main themes is often danger and how Peter overcomes it to save Mila. This can involve different kinds of threats like villains or natural disasters. And there's also the theme of trust, as Mila has to trust Peter to be saved. In many of these fanfictions, the development of their relationship after the rescue is also explored in detail. For example, how they become closer friends or if there are any romantic feelings budding between them. The fanfictions might also touch on themes of sacrifice, where Peter might have to give up something in order to save Mila.
I'm not sure which specific 'Peter Saves Mila' fanfiction is the best, but you can search on Wattpad. There might be some amazing stories there. You can look for ones with high ratings and positive reviews to find a great read.
Another aspect to consider is the context of the story. Is it set in a particular fictional universe that we know? If so, that will shape the events. For instance, if it's in a vampire - werewolf world like Twilight (assuming Bella is from that universe), Peter might be saving her from a vampire attack or something related to the complex politics of that world. The fanfiction could also deviate from the original source material in many ways, creating a unique story around Peter saving Bella.
One possible scenario could be that during a chaotic battle in the Civil War setting, Rhodey's suit malfunctions and he's about to crash. Peter, with his enhanced senses and web - slinging abilities, swings in just in time to catch Rhodey and safely land him. Another could be that Rhodey is trapped under some rubble from a destroyed building, and Peter uses his strength to lift the rubble off Rhodey.
A prevalent theme is heroism. Erik is depicted as the hero in these fanfictions when he saves Peter. Also, the theme of redemption can be seen sometimes. If Erik has made mistakes in the past, saving Peter can be a way of redeeming himself. In many of these fanfictions, the journey of Erik to save Peter is also about self - discovery. He learns more about himself and his capabilities during the process.
I'm not sure specifically which are the 'best' as it depends on personal taste. But some stories that have a high number of views and positive reviews on fanfiction platforms could be considered good ones.
Another theme is the idea of family. They have a father - son like relationship in the Marvel universe. So when Peter saves Tony, it's like protecting a family member. It emphasizes the strong emotional bond between them, which is often explored in these fanfictions.
There might also be other supporting characters. For example, there could be friends or family of Bella who are worried about her. Or perhaps there are antagonists in the story who put Bella in danger in the first place, and Peter has to deal with them. These additional characters can add depth and complexity to the story, as they interact with Peter and Bella throughout the plot.
In this fanfiction, it's possible that a symbiote - influenced villain could be the antagonist. Maybe someone who has bonded with a part of the symbiote and has a thirst for chaos. They might see Flash as an easy target to cause mayhem and draw out Spider - Man. Additionally, the Scorpion could be another antagonist. He might be hired by some shadowy figure to capture Flash in order to lure Spider - Man into a trap. There could also be a group of alien invaders who mistake Flash for someone important and Peter has to save him from their clutches.