What could be the plot in a 'Harry Potter is Inuyasha to Penny' fanfiction?

Maybe Harry and his friends are transported to the Inuyasha world and have to use their magic to fight demons alongside Inuyasha. For example, Hermione could use her vast knowledge of spells to help deal with powerful yokai.

It could be Voldemort from the Harry Potter world who somehow gains the power to enter the Inuyasha universe and wants to use Penny for some dark magic purpose. He sees her as a tool to achieve his ultimate goal of ruling both worlds.

Well, perhaps the plot could start with Harry Potter being transformed into a pup and somehow ending up in the 'Inuyasha' universe. Since he's a pup, he might be found by Kagome and taken in. He could gradually discover his magical abilities within this new world. As the story progresses, he might use his knowledge of magic from the 'Harry Potter' world to help Inuyasha and his friends deal with demons. For example, he could use spells to protect them from powerful demon attacks or to unlock hidden secrets in the 'Inuyasha' world that are related to magic. There could also be a sub - plot where some characters from the 'Harry Potter' world are trying to find and rescue Harry, leading to an interesting clash of the two universes.

It could be about a character from the 'Harry Potter' world, perhaps Harry himself as the master of death, somehow ending up in the 'Inuyasha' universe. Maybe he uses his magic skills and knowledge of death to help Inuyasha and his friends in their battles against demons.

Well, it's a really strange crossover concept. Inuyasha is from a very different universe than Harry Potter. But if he were to be Harry's father in fanfiction, it could involve some time - travel or interdimensional magic. Maybe some dark wizard used a spell to bring Inuyasha to the wizarding world and he had a relationship with a witch. However, it would be a huge stretch of both universes' lore.

A plot could involve a dark wizard using Inuyasha's sword, Tessaiga, to gain power. Harry and his friends then have to team up with Inuyasha to get the sword back. Inuyasha might be initially distrustful of them but realizes they are on the same side when he sees the dark wizard's evil deeds.

One idea could be that Inuyasha is transported to the wizarding world. He might mistake the magic there for some kind of powerful demon magic. For example, when he sees a wizard conjuring a Patronus, he could think it's a new kind of spiritual power. Another plot could involve Harry Potter and his friends accidentally stumbling into Inuyasha's feudal Japan world through a magical portal. They would have to learn to adapt to the new environment, with no wands but having to deal with demons.

The plot could involve a situation where a new form of dark magic is unleashed in the wizarding world, which spreads like wildfire and causes destruction similar to 911. The Ministry of Magic is caught off - guard. Hermione, with her vast knowledge, starts researching a way to counter this magic. Meanwhile, Ron and Harry lead the effort to protect the civilians. They set up shelters in places like the Room of Requirement and use Patronuses to guide people to safety. As they dig deeper, they discover that this dark magic was a planned attack by a long - hidden dark wizard group who wants to take over the wizarding world.

Adventure is another big theme. Both Harry Potter and Inuyasha are about characters going on quests. In fanfiction, this often means the characters from both series team up to face new threats or challenges that are a combination of the dark forces from each universe.

Yes, there might be some out there. Fanfiction often combines different universes, and it's possible that someone has created a story where characters from Harry Potter exist in the Inuyasha universe or vice versa. You can try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net.