One possibility is that Harry's late arrival at Hogwarts could change the dynamics of the relationships he forms. For instance, instead of being in the same boat as the first - years from the start, he might end up befriending some older students who take him under their wing. Also, his late start could mean that he discovers parts of Hogwarts that others haven't yet, like secret passages or rooms that are only accessible to those who arrive late or are in a certain situation.
There could also be some new characters introduced. Maybe a student who also had a late start in a previous year and can give Harry some advice. Or a magical creature that Harry encounters on his way to Hogwarts late and that creature becomes some sort of guide or protector for him during his time at Hogwarts.
In the fanfic, if Harry Potter goes to Hogwarts as a vampire, he could face discrimination. Vampires are often seen as dark creatures in the wizarding world. He might be isolated from his friends like Ron and Hermione. His appearance would also change. He'd have pale skin and fangs, which would be quite different from his normal look. Magic at Hogwarts might affect him differently too. Spells that are harmless to normal wizards could be more or less effective on him. He'd need to find a way to control his thirst for blood. If he couldn't, it could lead to chaos at Hogwarts. Maybe he'd have to find a substitute for blood, like some kind of potion.
Well, perhaps in 'harry goes to hogwarts later fanfiction', he could form new friendships. He might meet students from different backgrounds or even different magical cultures, which would bring a whole new dynamic to his Hogwarts experience. He could also discover new magical abilities or spells that were previously unknown to him, which would help him in his adventures at Hogwarts.
Well, he might discover some unique magical creatures in Canada that are different from those in the UK. Maybe he meets a friendly Canadian wizard who teaches him a special spell.
Well, he might go back to Hogwarts to search for some long - lost magic artifacts. It could be that there are secrets hidden in the castle that only he can uncover. And along the way, he could meet some old friends and have new adventures together. He might also find a way to further improve the security of Hogwarts after all the battles it has endured.
It would be a really interesting scenario. Maybe the characters in Hogwarts would get inspired by the fanfiction they read. For example, they could learn new spells or magical concepts from it. They might also be amused or confused by the different interpretations of their own world in the fanfiction.
Well, he might use his magic in ways that Camelot has never seen. Maybe he'd help King Arthur with some tough battles using spells like Expelliarmus. He could also introduce the wizards' world to the knights, which would be really interesting.
Well, he might be really confused at first. Storybrooke has its own set of magic and rules that are very different from the wizarding world. He could start exploring and find some similarities between the magic there and his own. Maybe he'd team up with some of the characters in Storybrooke to solve problems or fight against a common enemy.
In such a fanfiction, Harry might go to Voldemort to try and reason with him. Maybe he believes there's a chance to end the war without more bloodshed. He could offer Voldemort a way out, like exile instead of death.
Well, he might use his magic to adapt to the zero - gravity environment. Maybe he could create some sort of magical shield around himself to protect from radiation. And he could encounter strange alien creatures that he tries to understand using his knowledge of magic and the wizarding world.