Well, for one thing, Peter's life would be very different. He'd be in a darker, more brooding environment. Batman would probably train him even more rigorously. Peter's scientific knowledge could be a great asset to Batman's tech - based crime - fighting. In terms of the Marvel Universe, it would be a big loss. But in the DC Universe, he could become a key figure in Gotham's protection, and perhaps inspire other young heroes in the DC world.
Loki is known for his mischievous nature. In this fanfiction, he could bring out a more playful side in Peter. Peter might start to use his powers in more creative and unexpected ways, like using his web - slinging not just for fighting and swinging around, but also for creating elaborate pranks, inspired by Loki. Also, Loki's manipulative side could either make Peter more distrustful of others or teach him how to spot manipulation better, depending on how their relationship develops.
At first, it would be really rocky. Peter would be very wary of Venom given their past encounters. But as Venom shows his more caring side in the adoption, Peter would start to trust him a bit. They'd have to learn to communicate, which would be difficult because of Venom's different way of thinking.
In a 'Loki adopts Peter Parker' fanfiction, Loki might teach Peter some of his trickster ways. Maybe he'd show Peter how to deceive enemies in a more magical way than just using his Spidey - sense. For example, Loki could teach Peter how to create illusions to confuse villains during a fight.
Perhaps the plot involves Venom sensing that Peter has a pure heart despite their initial differences. Venom adopts Peter because he realizes Peter is alone in the world after some tragic event in the fanfiction. Venom then tries to teach Peter how to use his powers in a more aggressive way, which Peter is initially hesitant about but later comes to understand. This could lead to Peter becoming a more formidable Spider - Man with Venom's influence.
There could also be other characters like Happy Hogan. He might play a role in helping Tony take care of Peter, like driving him to school or keeping an eye on him when Tony is busy. And perhaps Aunt May could still be in the picture, adding an interesting layer to the story as she and Tony interact regarding Peter's upbringing.
One common theme is family. Bucky, who has lost so much, finds a new family in Peter, and Peter, who is an orphan, gets a father - like figure. Another theme is mentorship. Bucky uses his skills and experiences to mentor Peter in both his normal life and his superhero life.
Well, one possible plot could be that Peter Parker loses his Aunt May and is left alone. Matt Murdock, sensing his situation, decides to take him in. Matt could then start training Peter not just in academics but also in using his powers more responsibly, drawing from his own experiences as Daredevil. They might face some villains together, with Matt guiding Peter on how to balance his normal life with his superhero duties.
One possible plot could be that Black Widow, seeing Peter's potential and also his need for a more stable family situation after the death of his uncle, decides to take him under her wing. She could train him in more stealthy and psychological aspects of being a hero, different from what he learns from Tony Stark. For example, she might teach him how to extract information from enemies without using brute force.
Well, perhaps in the fanfiction, Natasha discovers Peter during one of her undercover missions in Queens. She realizes he's a brilliant but troubled kid with great power. So, she decides to adopt him. Then, she might introduce him to the wider world of international superhero relations. Peter would get to meet other heroes through Natasha's connections, and together they could go on missions that require both Peter's spidey - sense and Natasha's combat skills.