It could be Robin. Since he has a connection to Batman like Red Hood, he might have a unique perspective. He could be the one trying to understand Red Hood's motives and trying to bridge the gap between Red Hood and the rest of Young Justice. Also, his own growth as a hero could be further developed through this encounter.
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.
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.
I think Superboy would be really interesting. In Young Justice, he's still finding his place and dealing with his Kryptonian powers. In the Injustice universe, he'd be faced with a very different version of Superman. He could be a bridge between the two worlds, trying to understand the darker side of power that the Injustice Superman has embraced while also holding onto his own ideals from Young Justice.
Definitely Damian and Superboy. Superboy has his own issues with identity and control, and Damian's strong sense of self and discipline could either clash or create an interesting dynamic where they learn from each other. Maybe Superboy could teach Damian about the importance of emotions, while Damian could show Superboy some combat techniques.
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.
Definitely the interaction between Nightwing and Robin (from Young Justice). Since Nightwing was once Robin himself, he could offer a lot of wisdom and guidance to the younger Robin. Also, the interaction between Nightwing and Artemis would be great. They both have a lot of combat skills and a bit of a sarcastic side, so their banter would be really fun to read. Another interesting one would be Nightwing and Superboy. Superboy might look up to Nightwing as a more experienced hero and Nightwing could help Superboy better understand his powers and his place in the hero world.
I think Batman and Robin (from Young Justice) would be really interesting. Batman's brooding and strategic mind against Robin's youthful enthusiasm.
The team dynamics would likely become more complex. Young Justice has a set way of operating, with leaders and members having specific roles. Red Hood's arrival could disrupt that. Some members might be intrigued by his methods and want to incorporate them, while others might be put off. This could lead to internal arguments within Young Justice.
Miss Martian from Young Justice could be a great focus. Her powers of telepathy and shape - shifting make her a formidable opponent. Also, her experiences as a young hero trying to fit in and be accepted, especially when facing the more established Justice League, can lead to some really interesting character development and plot twists.
Well, it could be really exciting. Maybe there would be some initial conflict between the two groups. Young Justice is all about the younger heroes learning and growing, while Red Hood has his own darker, more violent methods. They might start off as enemies, but then realize they can work together to fight a common, bigger threat like a powerful supervillain.