Definitely Captain America. He's always been a leader and in the aftermath of Infinity War, his leadership would be crucial in keeping the remaining heroes together. Also, Thor, who has lost so much, would be a great focus. His journey of dealing with his losses and finding a new purpose could be really interesting.
Ant - Man could be a key character. Since he was in the Quantum Realm during the Snap, he might have some unique knowledge or abilities that could be the key to reversing what Thanos did. And of course, Black Widow. She's a strong character and her relationships with the other heroes would be interesting to explore in the post - Infinity War world, especially as she tries to hold things together.
Nebula is an interesting choice as well. She has a complex relationship with Thanos and has been through a lot. In the aftermath, she could be a key figure in trying to find a way to undo what Thanos has done. Also, her unique skills and knowledge of different parts of the universe could play an important role in the fanfic.
Well, Percy is a given. He's the hero of the series. His journey after the war, whether it's about finding peace or facing new challenges, would be a major focus. Then there's Annabeth. She's not only Percy's love interest but also a strong and intelligent demigod. Her role in rebuilding and strategizing post - war would be important. Another character who might be in focus is Thalia. She has a leadership quality and a connection to the Hunters of Artemis. After the war, she could be involved in protecting the demigod world in a different way. And Jason, if he's alive, his experiences in different camps and his relationship with Piper could also be explored in the context of post - war changes.
Iron Man is often a popular choice. His genius and sarcastic charm make him a great focal point. Fanfic writers like to explore his inner thoughts during the Infinity War chaos and how he might come up with unique plans to counter Thanos.
Captain Marvel is also very popular. Since she's so powerful, fanfiction often has her playing a major role in the fight against the remaining threats and in the restoration of the universe.
Thor would likely be a main focus. Given Waititi's work on Thor: Ragnarok, he could further develop Thor's character in the context of Infinity War, showing more of his growth and his humorous side in the face of the great threat.
Batman would be a great character to focus on. He doesn't have superpowers like the others but his intelligence and strategic mind are his greatest assets. In a 'Justice League Infinity War' fanfic, he would be the one trying to figure out the complex nature of the Infinity Stones, coming up with plans to outwit Thanos. He might also have some tense moments where he has to rely on the super - powered members of the League in ways he's not used to, which could lead to some great character growth and interesting interactions.
Obviously, Sasuke and Sakura are likely to be the main characters, given the name 'sasuaaku'. They are two very important characters in the Naruto universe, and a post - war story about them would be quite interesting.
In an Infinity War - like scenario in a fanfic, Todoroki Shoto would be highly likely to be involved. His dual - natured quirk of ice and fire gives him a wide range of abilities that could be useful against different threats. Momo Yaoyorozu would also play a key role. Her quirk allows her to create various objects, which could be essential for coming up with strategies to counter the Infinity War - like threats. Additionally, Aizawa Shota, with his Erasure quirk, could be a game - changer. He could potentially nullify the powers of some of the more dangerous villains or threats in the scenario.
Percy Jackson is definitely one of the most important. His leadership during the war and his relationships with other characters make him a central figure. Annabeth Chase too, as she is often the brains behind many plans. Grover would also be important as he has his own unique perspective and abilities that can play a big role in the post - war story.
Chika Fujiwara is also a popular character to focus on. Her bubbly and sometimes clueless personality can add a lot of humor to the story. You can write about her accidentally getting in the middle of Kaguya and Miyuki's relationship, or even having her own love - related subplots.