His other friends from Hogwarts might not even believe it at first. They might think it's some kind of elaborate prank. But once they realized it was real, they might try to find a magical way to communicate with him in Skyrim, or even try to open a portal to bring him back.
Hermione would probably be worried at first but then start researching all she can about space magic. Ron would be a bit more skeptical but also excited for Harry. They might try to find a way to communicate with him while he's in space, using some sort of enchanted device.
Hermione would probably be a bit worried at first. She might think it's a waste of time compared to studying magic. But then she'd see the benefits of physical fitness and start to support him. Ron, on the other hand, would probably make fun of him a little but also be secretly impressed.
Hermione would probably be very skeptical at first. She'd try to find logical explanations for Harry's new belief. Ron, on the other hand, might be a bit more open - minded or just find it really funny. He could make jokes about Harry using his wand as a lightsaber. His other friends like Neville might be a bit confused but also supportive in their own way, waiting to see what Harry does next.
Well, Hermione would likely approach it with her usual intellectual curiosity. She might study the cultural significance of the magic girl look in the wizarding world. Ron would probably make some teasing remarks initially, but deep down he'd still be loyal to Harry. And Ginny would probably find it really cool and might even want to join in on the fun, suggesting some improvements to Harry's magic girl look.
Perhaps he would befriend the outcasts at Nevermore. The ones who are different from the rest and understand what it's like to be in a new and strange place.
The common folk in Skyrim would probably be a bit scared at first. Harry's strange clothes and the fact that he can do magic so effortlessly would be quite intimidating. But if he helps them out, like getting rid of a bandit problem or curing a disease, they would soon start to accept and even revere him as a powerful hero.
His friends would be extremely worried. Hermione would immediately start researching every possible spell or charm that could be used to find him. She might also look into any historical records of similar disappearances during Auror missions.
The kids in Konoha like Naruto would probably be very excited. They love new and different things, and Harry with his magic would be really cool to them.
Ginny would be protective. If there were any fanfictions that she thought were disrespectful to Harry or painted him in a bad light, she'd be angry. But she'd also enjoy the ones that showed the depth of his character and his relationships with others, especially the ones that highlighted his relationship with her.
Hermione would immediately start researching. She'd be scouring the library for any books on magical illnesses and cures. Ron would be more of the practical one, getting Harry extra blankets and trying to make him laugh to keep his spirits up. Ginny would be constantly by Harry's side, holding his hand and giving him the emotional support he needs. Neville might bring some plants from the greenhouse that he thinks could have some healing properties.