The Death Eaters would likely be both scared and intrigued. They might see the Ghost Rider as a potential new weapon or a threat to their own dark plans. Voldemort himself would probably view the Ghost Rider as a rival in terms of power. He might try to either destroy the Ghost Rider or subjugate him. The other wizards in the Ministry of Magic would probably panic and try to contain the situation without really understanding what they are dealing with.
Some of the more superstitious characters in the wizarding world might believe that the Ghost Rider is a sign of the apocalypse or some sort of dark omen. Hagrid, for example, might be both in awe and a bit scared. He would probably keep his distance at first. The professors at Hogwarts would start researching immediately, trying to find any mention of such a being in their magical lore, while also trying to keep the students safe from any potential danger.
Ron would likely be more on the scared side at first. He'd be hesitant to get too close to the Ghost Rider, but as he saw the Ghost Rider using his power to fight against dark forces, he might start to respect him. Ron would probably crack some jokes along the way to ease the tension, like comparing the Ghost Rider's flaming head to a really over - the - top Weasley's Wizard Wheezes product.
Lucy would be a bit scared at first. She's used to dealing with magical creatures within the Fairy Tail world, but Ghost Rider is something entirely different. However, her curiosity would soon get the better of her, and she'd start asking questions about his powers and origin. Happy would probably hide behind Natsu, peeking out nervously. As for Wendy, she might be in awe of Ghost Rider's power, but also concerned about the potential danger he poses to her friends.
Hermione would probably immediately start researching. She'd scour the library for any mention of giant beasts in wizarding history to find a way to deal with Godzilla. Harry would be more cautious, trying to assess the threat level while also thinking about protecting his friends. Ron, on the other hand, might be a bit more panicked at first. He'd likely make some jokes out of nervousness as they figure out what to do.
Issei would probably be both scared and excited. He's used to dealing with powerful beings, but the Ghost Rider is on a whole different level. He might initially try to fight him out of bravado, but soon realize he's outmatched. Rias would be more cautious. She would see the Ghost Rider as a potential threat to her peerage and would try to figure out his motives before taking any action.
Neville would be terrified. Having faced his own fears in the wizarding world, Slender Man's appearance would bring back all those insecurities. Ginny, on the other hand, would be more defiant. She has had her own experiences with dark forces and would not be easily intimidated. The Weasley twins might see it as an opportunity for some new pranks, though they would quickly realize the seriousness of the situation. Hagrid would be confused as he has never seen such a strange creature in the Forbidden Forest. He might try to approach Slender Man in a friendly way at first, which could be a dangerous mistake.
Hero characters might analyze it from a moral perspective. They could either approve or disapprove of the way the story is told in the fanfiction depending on whether it aligns with their sense of right and wrong. Villain characters, on the other hand, might look for ways to use the ideas in the fanfiction to their advantage, like new ways to create chaos.
The Al Bhed in Spira might be the most interested in Harry Potter. They are known for their curiosity and their love for knowledge. They would want to study his magic, his wand, and his robes. They might even try to reverse - engineer some of his magic items. And as for the Ronso, they would likely be initially hostile, seeing Harry as an intruder. But if Harry showed his strength and honor, they could come to respect him.
Hermione, on the other hand, would likely have a more critical view. She'd analyze the fanfictions for their accuracy in terms of magic lore and Hogwarts traditions. If there were any inaccuracies, she'd be quite perturbed. However, she might also appreciate the creativity that goes into some of the well - written ones that add new dimensions to their magical world.
The professors at Hogwarts would have different reactions. Professor Snape might be secretly intrigued by this new and strange creature while outwardly showing disdain. Professor McGonagall would be concerned for the safety of the students and would start organizing protection spells around the school. Hagrid, being the lover of strange creatures, might try to approach it in a friendly way at first, until he realizes how dangerous it is.
Some characters might be excited. They could see him as a new source of knowledge and magic.