Well, it might also involve a lot of character interactions. The serious and often Earth - bound Avengers could learn a lot from the more laid - back and space - faring Guardians. Maybe Thor and Drax could bond over their love for physical combat and have some sort of friendly competition. And Black Widow could teach Gamora some new spy techniques.
Well, there could be an epic battle against a common enemy. Maybe Thanos somehow returns and the combined forces of the Avengers and Guardians have to use their unique skills to stop him. The Avengers' strength and strategic planning along with the Guardians' out - of - the - box thinking would make for an exciting story.
Well, there could be a huge battle against a common enemy. Maybe Thanos is back again and the combined forces of the Avengers and the Guardians have to use their unique skills to defeat him. For example, Iron Man could team up with Star - Lord to come up with a high - tech plan, while Thor and Drax could be on the front line, using their brute strength.
I think Thor and Groot would be an interesting pair. Thor is this powerful Asgardian with his hammer (or axe) and Groot is this gentle but strong plant - like being. They could have some really fun exchanges, like Thor trying to teach Groot some Asgardian sayings and Groot just responding with 'I am Groot' in his own cute way.
Another great pairing could be Hulk and Groot. Groot's calm and gentle nature might have an interesting effect on the Hulk. Maybe Groot could help calm the Hulk down when he's about to go on a rampage, or they could team up in a fight and Hulk could use Groot as a sort of living weapon. It would be a very unique dynamic.
Black Widow and Nebula would make for an interesting pair too. Both are strong female characters who have had a rough past. They could bond over their experiences of being in the shadow of more powerful male figures in their respective groups. And they could also team up to take on some of the more dangerous enemies, using their stealth and combat skills.
Iron Man and Star - Lord would be really interesting. Iron Man with his high - tech gadgets and sarcastic humor, and Star - Lord with his love for music and his own brand of cocky charm. They could either be constantly trying to one - up each other or end up being great friends who learn from each other's technology and combat styles.
They could end up having a friendly competition. The Avengers with their superpowers on Earth and the Guardians with their space - faring skills. Iron Man might be intrigued by Rocket's weapon - making abilities and try to collaborate on some new tech. And Thor could find common ground with Drax in terms of their brute strength and warrior spirit.
Star - Lord is also very popular. His roguish charm and his connection to the cosmic side of the Marvel universe bring a unique flavor to the fanfiction. Writers love to explore his backstory more deeply and his potential relationships with other characters.
Another cool fanfiction idea could be a time - travel story. The Avengers accidentally send themselves to the time when the Guardians were just forming. This leads to a chaotic but interesting adventure where they have to work together without ruining the future of both groups.