He would probably be curious. Naruto is always eager to explore new things. He'd touch it, try to break it with his strength, and when he fails, he'd be even more intrigued.
Naruto might first sense the Vibranium with his chakra. He'd be like 'What's this strange energy?' Then he'd start thinking of ways to use it. He could try to combine his ninjutsu with the properties of Vibranium. For example, if he can make his Rasengan stronger by channeling it through Vibranium or something like that. He might also show it off to his friends, like Sasuke or Sakura, and they'd all be amazed and start brainstorming together about its potential uses.
Naruto would probably be very cautious around Aizen at first. He's used to facing powerful enemies, but Aizen's deceptive nature would be a new challenge. Aizen, on the other hand, might see Naruto as an interesting specimen, someone with a strong will and great power that he could potentially manipulate.
Naruto would probably be very curious about the succubus. He might start by asking a lot of questions. He's not one to be easily intimidated, so he'd likely approach her without much fear.
Naruto would probably be very curious about Gandalf. He'd be asking a million questions about Gandalf's staff, his magic, and his long beard. Gandalf, on the other hand, might be intrigued by Naruto's determination and the strange power of chakra. He could see Naruto as a being with great potential for good in a world full of darkness, just like Frodo in Middle - earth.
Naruto would interact in a very enthusiastic way. He'd be in awe of the Avengers' powers and would want to learn from them. At the same time, he'd show off his own ninja abilities. He might bond with Hulk over their shared 'rage' - like Naruto has his nine - tailed fox anger and Hulk has his own. He'd also try to cheer up the more serious Avengers like Black Widow with his positive attitude. And he'd probably try to get them all to do some ninja training together.
Naruto would probably be very friendly and curious towards Tohka. He might start by asking her a lot of questions about her powers and where she's from.
Naruto would probably be very enthusiastic and friendly towards Arya. He might be constantly trying to get her to open up and share her stories. Arya, on the other hand, would be more guarded initially. For example, Naruto could offer to teach Arya some basic ninja moves like how to climb trees using chakra, and Arya could show Naruto how to use a bow and arrow more effectively.
Naruto might be initially cautious but curious. He would probably approach the anaconda slowly, trying to show that he means no harm. If the anaconda shows aggression, Naruto could use his shadow clone jutsu to distract it while he figures out a way to communicate or subdue it without hurting it. Since Naruto has a kind heart, he would likely try to befriend the anaconda in some way.