In Harry Potter and DC fanfics, odd ideas can range from crossovers where Harry Potter characters end up in the DC universe and vice versa. For example, imagine Harry Potter using magic in Gotham City. Another odd idea could be a character from DC, like Batman, somehow getting access to Hogwarts and trying to figure out the magical world's rules. It adds a whole new layer of creativity and unexpectedness to the stories.
They keep the fandom alive. With new and odd ideas, fans have more to talk about. For example, when a fanfic has a strange idea like a character having a magical pet that no one has ever heard of in the original books, it sparks discussions. People start debating whether it could fit into the 'Harry Potter' lore.
A really odd idea could be a fusion of the Death Eaters and the Suicide Squad. They are both groups with their own dark agendas. The Death Eaters' magic combined with the Suicide Squad's chaos would make for a very interesting and unexpected story. It could be set in a world where the two universes collide.
The phrase is rather confusing. Harry Potter fanfiction typically involves fans writing their own stories within the framework of the Harry Potter universe. It can include new characters, new plotlines, and different interpretations of the magic system. Regarding the 'is is swollen' part, it could potentially be a creative but very unclear way of trying to describe the nature of a particular type of Harry Potter fanfiction. Maybe it was an attempt to say that the fanfiction was overly elaborate or had some sort of exaggerated elements, but without proper grammar it's just a very strange statement.
One funny idea could be a story where the Marauders accidentally turn themselves into cats and have to deal with life in Hogwarts as felines. They'd be chasing mice instead of playing pranks on Snape for a while, and it would be hilarious to see them trying to communicate with the other students while being cats.
One idea could be that Supergirl, while on a mission in a different dimension, accidentally lands in the wizarding world of Harry Potter. She is initially confused by the magic there as it's different from her own powers. Harry and his friends are both in awe and a bit wary of her. They could team up to fight a common enemy that threatens both the wizarding world and the world Supergirl is from.
A fanfiction could focus on a group of Hogwarts students who encounter a Nundu while on an unauthorized adventure in the Forbidden Forest. They have to use their combined magic skills, including spells they've learned in Defense Against the Dark Arts, to fend off the Nundu and find their way back to the castle safely. This would be a great way to show the growth and teamwork of the students.
One idea could be that Harry discovers a hidden centaur community in the Forbidden Forest. He's initially scared but soon realizes they have a deep connection to magic that Hogwarts has not taught. He starts learning from them, about their archery skills and how they communicate with nature.
One idea could be that Fluttershy somehow gets transported into the Harry Potter world. Maybe she arrives at Hogwarts as a new kind of magical creature that the students have never seen before. Her gentle nature might initially cause confusion among the more rowdy students, but she could gradually make friends with the likes of Luna Lovegood, who would be intrigued by her uniqueness.
One idea could be that Harry creates a school for magical creatures. He realizes that there are so many unique and often misunderstood creatures in the wizarding world, and he wants to give them a place to learn and grow. This school could teach them how to interact with wizards in a positive way, as well as develop their own magical abilities.