One example could be a fanfic where the Weasley twins play an even more elaborate prank on Umbridge. They might transform her office into a giant Quidditch pitch, complete with flying bludgers that chase her around. Another is a story where Neville accidentally makes a potion that causes everyone's hair to turn into the shape of their Patronus. It's hilarious as Hermione has a book-shaped hair and Ron has a hair that looks like a piece of bacon.
Humor can be added through character quirks. Like Neville's clumsiness can be exaggerated in a funny way. For instance, he could accidentally trip over his own plant while trying to show it off in Herbology class. Also, using puns related to magic. For example, when someone says 'I'm so charmed, it must be the spell of good humor!'
One example could be a crossover with 'The Lord of the Rings' where Harry Potter and Frodo have a comical encounter. Maybe Harry accidentally casts a spell that makes Frodo's ring float away and they both scramble to get it back in a very clumsy and funny way.
It can also be humorous when characters mess up the timeline. Let's say Neville goes back in time and accidentally changes the outcome of a Quidditch match. The reactions of the players and the crowd who were expecting a different result can be really funny. And then Neville has to scramble to fix it while dealing with all the chaos he's caused.
First, know the characters well from both the Harry Potter world and the other franchise you are crossing over with. For example, if it's a crossover with 'Star Wars', understand how Harry's magical abilities would interact with the Force. Second, create a comical situation right from the start. Maybe Harry accidentally apparates into the Millennium Falcon. Third, use witty dialogue. If Harry meets Han Solo, they could have a banter about who has the cooler transportation method, the broomstick or the spaceship.
There is a fanfic named 'Time - Looping Laughter at Hogwarts'. This fanfic is full of humorous situations. For example, Hermione is constantly trying to figure out the logic behind the time loop while Ron is just enjoying the repeated feasts. And Harry is in the middle, trying to stop the loop while getting into all sorts of wacky adventures.
The unpredictability. In a time loop, anything can happen. The characters can make different choices each time, leading to new and funny situations. For instance, in some fanfics, Harry might try a completely different spell to get out of a situation in each loop, and the results can be hilarious.
Well, it allows for more light - hearted and comical interpretations. For example, it can take the serious characters like Snape and show them in funny situations. Maybe Snape accidentally steps on a magical whoopee cushion in the staff room. It gives readers a different view of the familiar world, making it seem less dark and more fun.
One example could be a fanfic where Draco Malfoy constantly makes sarcastic remarks about Hogwarts' new rules. For instance, when they introduce a new dress code, he might say, 'Oh, because a different shade of robes will surely improve our spell - casting.' Another could be a story where Hermione uses her sarcasm to deal with Ron's silly ideas. Like when Ron suggests they use a spell he just made up to solve a problem, Hermione might reply, 'Yes, because your half - baked spells have always worked so well in the past.'
Another reason for its popularity is that it gives fanfic writers a chance to be really creative. They can create unique troll characters with their own personalities and senses of humor. And when these trolls interact with Harry, it can lead to all kinds of wacky storylines. Also, it's a break from the more serious and often dark themes in the original Harry Potter series, providing a fun escape for readers.