Naruto would probably be very open and friendly towards Cersei at first, while Cersei would be suspicious and guarded. For instance, Naruto might greet her with a big smile and offer his help, but Cersei would think he has some ulterior motive.
Naruto, being from a world where he values life and friendship highly, would constantly try to engage Cersei in positive conversations. He could share stories about his village and how they all work together. Cersei, on the other hand, would be dismissive at first. But as Naruto persists, she might start to listen, especially if she sees some advantage in it for her own power - grabbing schemes. As time goes on, Naruto's positive attitude could start to wear down Cersei's cold exterior, and she might even start to show some vulnerability around him.
At first, Cersei would probably be haughty and distrustful of Naruto. After all, he's an unknown entity in her world. But Naruto, being Naruto, would be friendly and try to break the ice. He'd probably talk about his village and his friends back home. Cersei might be intrigued by his strange powers and his different way of looking at things. As time passes, they could develop a sort of begrudging respect for each other.
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 probably be very curious about Android 21. He'd likely approach her with his usual friendly and open - minded attitude. Android 21 might be a bit reserved at first, but Naruto's enthusiasm could break the ice. They could start by just talking about their different abilities.
Naruto and Android 21 might interact in various ways. At first, Naruto would probably be very curious about Android 21. He's used to dealing with all kinds of strange things in his world, but Android 21 would be a whole new level. Android 21 could be interested in Naruto's physical abilities and chakra system. She might try to approach him in a friendly way to study him, but Naruto, being a ninja, would be cautious. Eventually, they could either become friends if Android 21 proves she has good intentions or remain enemies if she tries to harm Naruto or his friends.
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 would probably be very curious about Android 21. He'd be asking her a lot of questions about where she came from and what her powers are. Android 21, on the other hand, might be initially confused by Naruto's overly friendly and energetic nature.