Artemis could be another candidate. She's a bit more guarded than some of the others. But Naruto's innocent and friendly nature might break through her defenses. She would be intrigued by Naruto's strange abilities and his different way of dressing and acting, and Naruto would be interested in her archery skills and combat abilities.
It could also be Naruto and Superboy. Superboy has a bit of an outsider feeling in Young Justice, and Naruto, being from a different world entirely, would also be an outsider in this new universe. They might sense that similarity in each other and start interacting. Superboy's strength and Naruto's ninjutsu would make for an interesting comparison.
Probably Naruto and Robin. Robin is the leader - type in Young Justice, always thinking and strategizing. When Naruto shows up, Robin would be the one to approach him first, trying to figure out who he is and what his intentions are. Naruto, being friendly and curious, would be open to the interaction.
Another possibility is Flash and Naruto. Flash, with his super - speed, would be one of the first to reach Naruto if he suddenly appears in the DC world. Flash's friendly and curious nature would lead him to start a conversation with Naruto right away. Naruto would be amazed by Flash's speed and might try to compete with him in some way, which could be the start of their interaction.
Probably Naruto and Twilight Sparkle. Twilight is the intelligent and curious one in the My Little Pony world, always eager to learn new things. Naruto, with his unique ninja abilities, would be something completely new for her. She would likely approach Naruto first to find out more about him.
Applejack and the Heavy might be the first to interact. Applejack is a hard - working and practical character. The Heavy is a no - nonsense fighter. Applejack might see the Heavy and be curious about his large size and strange weapon. The Heavy, on the other hand, might be interested in Applejack's farming skills and the fresh apples she might be carrying. Their down - to - earth personalities could lead to an initial interaction.
Superboy from Young Justice might also be a likely candidate. He's often looking for his place and trying to prove himself. Meeting the Bat family could be a chance for him to show what he can do. He might be a bit brash at first, but once he realizes they are all on the same side, he could be quick to form an alliance. He could see Batman as a role model in a way, someone who is strong and has a sense of justice.
Probably Ash and Iron Man. Iron Man is always curious about new things and Ash with his Pokémon would be quite an interesting sight for him. He'd likely approach Ash first to ask questions about what he is and what those strange creatures are.
It could be Percy and Black Widow. Natasha is a master of reading people, and she'd notice Percy right away. She might approach him in a more stealthy way compared to the others, trying to assess if he's a threat or an ally. And Percy, being used to danger, would be on his guard at first, but then start to trust her as she shows her good intentions.
Spyro and Twilight Sparkle would be likely to interact. Twilight is very intelligent and well - versed in magic, and Spyro has his own dragon powers. They could learn from each other. For example, Twilight could study Spyro's dragon magic, and Spyro could learn about the complex magic system in Equestria from Twilight.
Another likely pair could be Vegeta and Batman. Vegeta is proud and calculating, much like Batman. Batman would be intrigued by Vegeta's Saiyan pride and his combat skills. Vegeta, on the other hand, might respect Batman's strategic mind and his ability to fight without superpowers. Their first interaction could be a tense one, as Vegeta may not immediately trust Batman, but it would be interesting to see how they develop a relationship over time.
Robin from Young Justice and Agent A would likely have an interesting interaction. Robin is highly intelligent and a great detective in his own right. Meeting Agent A, who may have different methods of investigation, could lead to some really cool exchanges. They could compare notes on cases and share their insights on solving mysteries.
Definitely Robin from the Batkids and Superboy from Young Justice. Robin is the highly skilled detective and acrobat, while Superboy has superhuman strength and a bit of a temper. Their interactions could be really interesting as Robin tries to use his wits to keep Superboy in line during a mission, and Superboy might get frustrated with Robin's over - planning at times.