It could be part of an ancient magic experiment gone wrong. In the past, some wizards were trying to bring extinct creatures back to life for various reasons. The Spinosaurus was one of the results, and it has been living secretly in the wizarding world ever since. In the fanfiction, it could be that Hermione discovers some old scrolls about this experiment and they start to search for the Spinosaurus.
The Spinosaurus might be a guardian of a hidden magical power source. The legend says that only those who can befriend the Spinosaurus can access this power. Harry and his friends, always in search of ways to defeat Voldemort, hear about this legend and set out on a journey to find the Spinosaurus and gain the power it guards.
A Spinosaurus could be magically created by a dark wizard as a weapon. But then it breaks free and wanders into the Forbidden Forest. Harry and his friends would then have to find a way to either tame it or get rid of it without harming it too much.
Harry Hook often fits in as an alternate version or a new character added to the existing Harry Potter universe in fanfiction. He can bring new storylines and interactions.
It could be that Element 115 is related to the dark arts in the fanfiction. Maybe it was once used by dark wizards to create powerful and evil spells, and now it has resurfaced, causing a stir in the wizarding world. It might be up to Harry and his friends to figure out how to deal with it. This would add a new and exciting plotline to the familiar 'Harry Potter' world.
Riku might be a character who has been summoned to the 'Harry Potter' world by a powerful spell gone wrong. Once there, he has to adapt to the rules of magic in this new world. He could start by learning basic spells at Hogwarts and gradually become a key figure in the fight against the dark forces, using his own brand of courage and determination that is different from the typical Hogwarts students.
Well, in fanfiction, the 'Harry Potter Lantern' could be a part of a new sub - culture within Hogwarts. Maybe there's a group of students who study the Lantern's magic and they have their own secrets and rituals. This could create a whole new set of relationships and rivalries among the characters. For example, the Gryffindors might want to use the Lantern's power for good, while some Slytherins might be tempted to use it for more self - serving reasons.
The Bard can fit as a new kind of magical being. He could bring his own brand of magic, perhaps music - based magic, that is different from what the wizards in Hogwarts are used to. For instance, he might be able to use melodies to heal wounds or break curses.
There could be a fanfiction where a wizard or witch has the ability to communicate with the Spinosaurus and they form an unlikely alliance. This alliance might be crucial in a battle against the Dark Lord, with the Spinosaurus's strength being a great asset. For example, the Spinosaurus could help defend Hogwarts by using its powerful jaws and large size to fend off the Death Eaters.
The characters from 'Shameless' are known for their scrappy and street - smart nature. In the 'Harry Potter' world, they could be Muggles who accidentally discover the wizarding world. For example, Carl could be exploring an old abandoned building and find a hidden passage to Diagon Alley. Or they could be Squibs related to some important wizarding families. Like Veronica could be a Squib who has always felt out of place in the Muggle world and finally finds a sense of belonging in the wizarding world's fringes.
The magical world would have to be very secretive. They might have agents in every major city to keep an eye on any magical accidents that could expose them. For instance, if a wizard accidentally made a car fly in the middle of a busy street.
Houdini can fit in as an inspiration for new types of magic. His skills in escape and illusion can be translated into new spells or magical techniques in the Harry Potter universe.
Well, Celebi is a Pokémon. In a Harry Potter fanfiction, it could be introduced as a very rare magical creature from a far - off land. Maybe it has time - traveling abilities like in the Pokémon world, and in the wizarding world, it could be used to correct historical mistakes or prevent dark wizards from rising in the past. For example, Dumbledore might discover Celebi and use its power to gain more knowledge about Voldemort's early days.