The characters from Harry Potter would have a lot to adjust to on Pandora. For example, Hagrid might be in awe of the large and strange creatures on Pandora. He could try to communicate with them in his own way. The students from Hogwarts would need to learn how to move around Pandora. Some might use magic to fly, but they'd also have to be careful not to disrupt the natural balance. Ginny would probably be one of the bravest in exploring new areas and trying new things, like riding the flying creatures on Pandora. And Dumbledore, if he were there, would be observing and guiding the others, seeing how the magic of Pandora and the magic they know can coexist.
When it comes to adapting to Pandora, Harry Potter characters would face many challenges. Neville, for instance, would be both excited and a bit scared. He might find some plants on Pandora that remind him of the ones he studies at Hogwarts, but also much more dangerous. Draco would likely be initially dismissive of Pandora, thinking it was beneath him. But as he saw the power of Pandora's nature, he might start to change his view. The Weasley twins would be looking for ways to have fun and make mischief. They could try to create new magical items using Pandora's resources, but they'd have to be careful not to anger the Na'vi or disrupt Pandora's delicate ecosystem.
Hermione would probably be the first to start studying Pandora's ecosystem. She'd be fascinated by the unique plants and animals. Ron would be a bit more hesitant at first, but he'd quickly warm up when he discovers the delicious new food sources. Harry would be focused on how to use his magic in this new environment and would likely try to make friends with the Na'vi to understand their culture better.