The Black Magic Gundam could be a protector. Maybe it was created by an ancient wizard to safeguard the wizarding world from a great threat that was foreseen. In the fanfiction, it could be reactivated to fight against a new dark force that the normal spells and magic of the wizards can't handle.
One way to integrate it could be through time - travel. Suppose a wizard from the future where Gundam technology exists travels back to the Harry Potter era and brings with him the blueprints for the Black Magic Gundam. This causes a stir as different factions in the wizarding world either want to use it for their own gain or fear its power and want to prevent it from being built.
It could be a villain. Maybe it's been corrupted by dark magic and is out to attack students at Hogwarts.
Black Ivy could be a symbol. It might represent something like a forgotten or dark part of Hogwarts' history. For instance, it could have been planted by an evil wizard long ago and now holds some sort of ancient magic that only a few know about.
Magic in this fanfiction is the bridge between two different universes. It allows Harry to enter the world where Shmi is. His spells like the Apparition spell, although it might work differently in the Star Wars universe, could help him quickly reach Shmi in times of danger. And his magic can also be used to communicate with the locals in the Star Wars world if they can sense magic. He could use a translation spell to understand their languages and get help in saving Shmi.
Well, magic is almost everything in an emergency in Harry Potter fanfiction. It can be used to detect danger, like the spell that shows if there are dark wizards nearby. It can also be used to create barriers or traps to keep the threat at bay. And if the emergency is something like a collapsing building (maybe due to a dark magic attack), magic can be used to hold it up until everyone is safe.
Christmas Magic in fanfiction can serve as a plot device. It might bring characters together in unexpected ways. For example, two characters who were on bad terms might be brought closer because of a shared Christmas Magic experience, like finding a hidden Christmas grotto in the Forbidden Forest that can only be accessed during the Christmas season and having to rely on each other to get out.
Light magic can also be a source of creativity in fanfiction. Writers might create new light magic spells that have unique effects, like a spell that makes plants grow in an instant and bloom with beautiful flowers. This kind of light magic can be used to transform the Hogwarts grounds into a wonderland, adding a touch of magic and beauty to the familiar setting.
Ancient magic often serves as a plot device. It can introduce new and powerful spells or abilities that the characters need to master. For example, it could be the key to defeating a new dark wizard or solving a mystery that has long haunted the wizarding world.
Illusion magic can add mystery. For example, it can be used to create false trails for characters to follow. In some fanfictions, a villain might use illusion magic to mislead the heroes, making them think they are going in the right direction when they are actually being led into a trap.
Imagination is the driving force behind Harry Potter fanfiction magic. It enables fans to step into the shoes of a wizard or witch and create their own magical experiences. Fanfiction writers can use their imagination to twist the rules of magic. Maybe they imagine a situation where a Muggle - born wizard has a completely different type of magic that is not seen in the original books. This can add new layers of intrigue and excitement to the story. Also, it can be used to bring back characters from the dead in a way that is unique to the fanfiction, all through the power of imagination in the context of the Harry Potter magic.