Another character could be Doctor Strange. Waititi might explore the more mysterious and comical aspects of Strange's character. He could put Strange in situations where his magic is used in unexpected and humorous ways, all while still being relevant to the overall plot of Infinity War.
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.
I think he would also pay attention to the Guardians of the Galaxy. Waititi could bring out their individual quirks even more, especially with characters like Rocket and Groot. He might create some new and funny interactions between them and the other Avengers.
A Taika Waititi Infinity War fanfic could be full of his signature humor. He might add some really off - the - wall and comical moments to the otherwise intense story of Infinity War. For example, he could have Thor in some really absurd situations while still maintaining the essence of his character's journey in the movie.
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.
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.
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.
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.
Loki in a cartoon Infinity War fanfiction could be a fascinating focus. He's so full of mischief and trickery. You could show his internal struggle between his desire for power and his loyalty (or lack thereof) to his brother Thor in a more cartoony, over - the - top way. Maybe he teams up with the heroes against Thanos in the most unexpected way, all while plotting his own schemes on the side.
Another option could be Ronald Speirs. His mysterious and tough - as - nails personality would make for an exciting character in a 'Kuroinu' - like setting. He could be the one who is not afraid to take on the most dangerous foes in 'Kuroinu' and his actions could drive the plot forward.
Definitely the two male leads. Their competitive and comical relationship is the heart of the movie and can be explored further in fanfic. You can show more of their backstory and how they became such rivals.
Mantis. She has the power to manipulate emotions, which is a very interesting ability. In fan fiction, she could use this power to manipulate Thanos in a different way than what we saw in the movie. Maybe she could make him feel extreme guilt about his actions, causing him to hesitate at a crucial moment.
Hawkeye. He's often overlooked but could be really interesting in a fanfic. He could have a solo mission during the events of Infinity Wars where he discovers a secret about one of the Infinity Stones that no one else knows. Maybe he has to use his archery skills in a completely new and creative way to protect this knowledge from falling into the wrong hands.