He could have a Hippogriff. After Buckbeak's incident, he might develop a special bond with Hippogriffs and get one as a pet. He would need to learn how to take care of it, like making sure it has enough space to fly and proper food.
A Niffler would be a great pet for Harry. Nifflers are cute and love shiny things. Harry could find a Niffler that was abandoned and take it in. He would have to deal with its habit of stealing shiny objects all the time, which could lead to some funny situations in the story.
I'm not sure. It could be a cat, a dog, an owl, or something more exotic like a dragon or a phoenix.
There's no way to know for sure without more details. He might be a cat. Cats are often used as pets in fanfiction too. They can be independent and mysterious, which can add an interesting dynamic to the story.
It could be a snowy owl, just like Hedwig. In the original series, Hedwig was Harry's loyal and beautiful owl. A fanfiction might follow this idea and have Harry find a young snowy owl that he bonds with immediately.
Maybe Harry has an encounter with a hurt Kneazle. He decides to take it in and nurse it back to health. Through this process, he realizes how much he enjoys taking care of animals. He then begins to visit Hagrid more often to learn about different magical creatures and soon becomes known among his friends as a real pet fanatic.
A Demiguise could be his pet in fanfiction. Demiguises are gentle, ape - like creatures that can turn invisible. This would be a very unique pet for Harry. It could help him in many situations where he needs to hide or sneak around. And its gentle nature would contrast with some of the more dangerous creatures in the wizarding world.
Well, in certain fanfiction, he could have a Kneazle. Kneazles are intelligent cat - like creatures. They can detect untrustworthy people and are very good at finding things. They would be a great addition to Harry's adventures as they are quite perceptive and could help him out in tricky situations.
Perhaps Draco could be a Kneazle. Kneazles are intelligent and independent, which would suit Draco's personality. As a Kneazle, he might be constantly sneaking around and getting into places he's not supposed to. Harry would have to use his wits to keep Draco out of trouble and also earn his trust, as Kneazles can be quite picky about who they bond with.
In the 'Harry is the pet of someone' fanfiction, the owner of Harry could be a variety of people. It could be a young child who has always wanted a pet and finally gets Harry. This child would be full of excitement and love for their new pet. Or it could be an older person, perhaps a retiree, who has time to spend with Harry and enjoys the simple pleasures of having a pet around. Another possibility is that the owner is a magical being in a fantasy - themed fanfiction, and they have chosen Harry as their pet for some special reason related to the magic in that world.
One possible adventure could be that Harry and his cat discover a hidden magical garden. The cat might lead Harry to it by chasing a strange, glowing butterfly. In the garden, they find plants that can talk and give them advice on magic spells.
A fleet of magical ships is also a possibility. These ships could be made of magical wood and have various enchantments. They might be able to travel between different magical dimensions or through dangerous magical waters. Maybe they are crewed by a mix of wizards, magical creatures, and even house - elves, all under Harry Potter's leadership in the fanfiction world.