One really funny Harry Potter fanfic is 'The Day Harry Potter Swapped Bodies with Ron Weasley'. Just imagine the chaos that ensues when two best friends suddenly find themselves in each other's bodies. They have to deal with each other's daily routines, from Ron trying to handle Harry's fame and Harry having to deal with the Weasley family dynamics in a very different way. It's full of laugh - out - loud moments.
The use of character quirks can make a Harry Potter fanfic funny. For example, if the author exaggerates Neville's clumsiness in a new and creative way. Maybe Neville accidentally knocks over the entire potions classroom while trying to catch his toad. Another factor is the unexpected twists on the original story. Like if Dumbledore suddenly starts break - dancing during a serious Hogwarts meeting.
One great 'funny grey' Harry Potter fanfic could be 'The Misadventures of Grey - Haired Harry'. It has Harry in some rather comical situations where his hair turns grey prematurely due to a spell gone wrong. Another one might be 'Grey - Day at Hogwarts' which is full of humorous moments as Harry tries to navigate through a Hogwarts that has turned grey for some mysterious reason. And there's also 'Grey - Eyed Harry's Pranks' where Harry uses his new - found grey - eyed powers in the most hilarious ways.
A really interesting 'Harry Potter' funny fanfic with plot twists is the one where the time - turner Hermione used actually sends her and Harry back to the time of the Founders of Hogwarts. The humor comes in as they try to fit in and use their modern - day magic in a very different era. There are plot twists like when they accidentally change the house colors and the sorting system. Also, they end up befriending a young Slytherin who is nothing like the Slytherins they know, and this young Slytherin helps them get back to their own time in a very unexpected way.
Well, just based on that title alone, it's difficult to determine its quality. There are so many aspects that make a Harry Potter fanfic great. For example, it could explore new relationships between the characters, or create exciting new magical adventures. But we don't know if 'skull is harry potter fanfic' does any of those things. So, it might be good, it might not.
One great innocent Harry Potter fanfic is 'The Marauders' Map Mischief'. It focuses on the light - hearted adventures of Harry and his friends as they discover new secrets within Hogwarts using the Marauders' Map. It's full of humor and friendship, staying true to the innocent and magical feel of the original series.
I really like 'A Dragonborn's Adventure in the Wizarding World'. It combines the lore of both Dragonborn and Harry Potter. The author does a great job of integrating the combat skills of the Dragonborn into the magical battles at Hogwarts. For example, when facing dark wizards, the Dragonborn uses his shouts in unexpected ways to counter their spells.
One popular platform is Archive of Our Own (AO3). It has a vast collection of Harry Potter fanfics with different genres and themes. Another is FanFiction.net which has been around for a long time and has a large number of Harry Potter fan works as well.
The 'grey' aspect in a Harry Potter fanfic can add an element of mystery. When combined with humor, it creates a unique charm. For example, if Harry has a grey - colored magical item, it can lead to all kinds of comical misunderstandings. It's different from the typical Harry Potter scenarios we're used to, which makes it appealing.
In some time travel fanfics, Hermione might try to correct the timeline but ends up making things even more chaotic. For example, she tries to stop a prank that Fred and George were supposed to play, but by doing so, she causes a chain reaction that has Professors Snape and McGonagall teaming up in a hilarious dance-off to resolve the magical chaos. It's a really funny and unexpected twist.
I'm not sure if it's common. There are so many different types of fanfics in the Harry Potter fandom. Some focus on relationships, others on new adventures. While metamorph - related ideas are interesting, it might not be as common as, say, romance - centered fanfics.