The interaction between Red Robin and Flash could be really fascinating. Flash is all about speed and light - heartedness, while Red Robin is more of a brooding detective type. Flash could try to get Red Robin to loosen up a bit, and Red Robin could teach Flash some of his detective skills. They could have a really fun dynamic where they learn from each other and their different approaches to heroism.
I think the interaction between Red Robin and Batman would be the most interesting. Since Red Robin is Batman's protege, seeing how their relationship plays out in the context of the Justice League would be cool. Maybe Batman would be more protective or more critical of Red Robin in front of the other League members.
I think Red Hood himself would be the most interesting. He has such a complex backstory, being a former Robin and now a vigilante with his own set of rules. His interactions with the Justice League members, who have their own moral codes, would be really fascinating to read about.
It could be Ben himself. His ability to transform into various aliens gives him a unique edge. He can adapt to different situations quickly, which would be fascinating to see when interacting with the Justice League.
I think Robin could be very interesting. He's young and full of energy, and in a meeting with the Justice League, he could be in awe of them at first but then prove himself. He might learn new skills from the League members and also show them that the Batfam has its own strengths. For example, his acrobatics and quick thinking could come in handy during a mission, and his interactions with characters like Aquaman or Green Lantern could be really fun to read about.
The interaction between Starfire and Beast Boy would be fascinating. Beast Boy can transform into different animals, and Starfire has her own set of superpowers. They could have some really fun and comical moments together, like when Beast Boy turns into a small animal and Starfire is trying to figure out how to communicate with him. Also, they could team up in battles in really creative ways, with Beast Boy using his animal forms to distract enemies while Starfire blasts them with her energy.
Batman could be the most interesting. He has a connection to both the Justice League and the Gotham villains. He knows how the villains operate better than anyone else in the Justice League. So, in this fanfiction, he would be in a unique position, trying to bridge the gap between the two groups and deal with his own complex relationship with the villains while being part of the super - team.
I think Nightwing would be the most interesting. He has this unique blend of skills and a different background compared to the more well - known Justice League members. His time as Robin and then his growth into Nightwing gives him a lot of depth to explore in the story.
The interaction between Daredevil and Batman would be really interesting. They both are highly skilled detectives, but Batman has all his high - tech gadgets while Daredevil relies on his enhanced senses. They could compare notes on crime - fighting techniques.
Batman Beyond would be the most interesting. He's a new take on the Batman concept with his high - tech suit and different personality compared to the original Batman. He has to prove himself to the Justice League and show that he's just as capable, if not more so, in his own time.
Definitely Batman and Wonder Woman. Their different outlooks on justice would create some intense conversations. Batman is more about the gritty, street - level justice, while Wonder Woman has a more idealistic, Amazonian view.
Another interesting interaction would be between Oliver Queen (Green Arrow) and Batman. Both are non - superpowered heroes who rely on their wits, combat skills, and gadgets. They could share their knowledge of different fighting techniques and strategies. Oliver could learn from Batman's more high - tech approach, while Batman could gain some insights from Oliver's more improvised and outdoorsy combat style.