There are fanfictions where Harry uses his connection with magical creatures. He befriends a group of powerful and intelligent magical creatures, like the centaurs. They come to Hogwarts and, through their own means, intimidate Umbridge so much that she leaves. The centaurs could use their wisdom and their own form of magic to make Umbridge feel unwelcome and out of place, until she finally decides she has no choice but to go.
In some fanfictions, Harry discovers a long - forgotten magic charm that has the power to make a person's worst nightmares come true. He uses it on Umbridge, and she is so terrified by the nightmares that she runs away from Hogwarts. The charm could be something that is based on the person's deep - seated fears, and for Umbridge, it might be related to losing her power and being publicly shamed.
Snape could face some backlash from the Ministry. If they find out that he was involved in getting rid of Umbridge, they might try to find ways to punish him or at least keep a closer eye on him. However, his skills at subterfuge would likely help him avoid any serious consequences.
In some versions, Snape uses his knowledge of the Dark Arts and Hogwarts' secrets. He might set up a situation where Umbridge is lured into a restricted area of the castle and gets into trouble with some magical creature or ancient magic, causing her to be removed from her position.
In some fanfictions, Harry might use his powerful magic skills, like advanced spells he's learned secretly, to outwit Umbridge. For example, he could create a series of complex illusions that confuse her and lead her to leave Hogwarts on her own.
One creative prank could be that Harry uses magic to make Umbridge's quills write only nonsense whenever she tries to write a decree. Another could be that he enchants her office so that every time she sits in her chair, it makes a loud and embarrassing noise, like a donkey braying. And he could also charm her teacup to refill with a really bitter-tasting potion instead of tea.
Harry could use a transfiguration spell to turn Dumbledore's beard into a bunch of snakes. That would be quite a shock for Dumbledore when he looks in the mirror. Another way could be to magically make all of Dumbledore's papers in his office fly around and form funny shapes like animals or wizards doing silly dances.
One way is to base the name on a specific location in the wizarding world. For instance, if your story takes place a lot in Diagon Alley, you could name it 'Diagon Alley Adventures: A Harry Potter Fanfic'.
Some fanfictions depict Hermione using her knowledge of ancient magic. She discovers a spell that can create a portal directly into Harry's room at the Dursleys'. She steps through the portal, grabs Harry, and they both jump back through into a safe wizarding haven. It's really cool because it shows how Hermione's thirst for knowledge can be used to save her friend in unexpected ways.
Some fanfictions explore the idea of using Incredibles' technology in the wizarding world. Imagine a world where the wizards use the Incredibles' jet to travel instead of broomsticks or the floo network. It would completely change the way we think about the transportation in the Harry Potter universe.
One creative idea is having Darkrai be a guardian of some ancient wizarding artifact. In this fanfic concept, Harry has to work with Darkrai to protect the artifact from dark wizards. It combines the Pokémon's protective nature with the high - stakes of the Harry Potter universe.
In some fanfictions, the cars are actually enchanted objects in the wizarding world from the very beginning. They are like sentient magical beings that have been hidden away for years. And then the Harry Potter characters discover them and have to figure out how to use them to defeat the dark forces. It's a really cool concept that combines the technology - like aspects of the cars with the magic of Harry Potter.