Captain America would also be a key character. His strong moral compass and leadership skills would be important when dealing with the complex ethical issues of time travel. He might be the one to keep the Avengers in line and ensure they don't make any rash decisions that could have disastrous consequences for the timeline.
Tony Stark is a likely focus. His intelligence and experience with technology, especially time - travel technology in the movies, make him a central figure. He could be the one to figure out the mechanics of time travel and lead the Avengers in their time - traveling adventures.
Tony Stark is likely to be a focus. His flamboyant and playboy - like personality could lead to some really interesting scenarios when affected by a love potion. He might make grand gestures towards someone he wouldn't normally be interested in. Another likely character is Natasha Romanoff. Her complex past and guarded nature could create a great contrast when the love potion breaks down her walls.
Ant - Man would be a likely candidate as his power already involves size - changing. In fanfiction, his ability could be enhanced or malfunction, leading to all kinds of interesting scenarios. For example, he could accidentally make all the other Avengers the same size as him, creating a whole new dynamic for the team.
Loki is another favorite. His mischievous nature means that he could cause all sorts of chaos during time travel. He might try to take advantage of the time - jumping to create his own power base in different timelines or even try to outwit Thanos in ways that the other Avengers can't.
Gon would be a likely focus. His determination and simple - minded yet strong - willed nature could lead to some interesting time - travel related stories. He might be on a quest to save someone in the past or prevent a future disaster.
Hulk (Bruce Banner) could be the focus. Since his body is already in a state of flux between his human and Hulk forms, any changes in his diet or a scientific experiment gone wrong could potentially cause him to gain weight in his human form, which would add an interesting twist to his character.
Captain America would be really interesting. His moral compass and leadership skills in a time - travel scenario would be fascinating. He has to deal with the changes in the past that the time travel causes, and also make sure the other Avengers stay on the right path. He might struggle with seeing his old world again and having to make choices that could change it further.
Captain America could be a likely character to be betrayed. He represents the old - school values of the Avengers, and in a more modern, cynical world within fanfiction, some might see his ideals as outdated and turn against him. Also, Tony Stark. His wealth and sometimes over - confident attitude could make some of the other Avengers, especially those with more humble backgrounds, feel resentful and potentially betray him. And Thor, being an Asgardian, might be betrayed due to the other Avengers' mistrust of his alien nature or the potential threat Asgard could pose.
Shinji is a very likely character. His complex relationship with his father and his role as the main pilot make him a prime candidate for time travel scenarios. He could go back in time to try and fix things or understand his father better.
Definitely Tony Stark. His complex personality, his wealth, and his role as a sort of father figure in some scenarios make him a great focus. He can be shown as mentoring the younger Avengers or having heart - to - heart talks with them about responsibility.
Definitely Torunn. She has a great backstory being Thor's daughter, and her powers are really interesting. You can explore her journey of living up to her father's name and forging her own path as a hero.