Well, you could do a crossover where Harry has the powers of a godlike being from Japanese mythology, like Amaterasu. He could have the power of the sun, using it to vanquish evil. Maybe he could also cross with a powerful African deity and incorporate their unique magic into his existing skills, creating a whole new set of spells and abilities.
For a 'harry godlike crossover fanfiction', consider crossing Harry with an angel - like a seraphim from Christian angelology. He could gain the ability to fly at super - speeds and have a divine glow. His magic could be enhanced with holy power. Also, he could cross with a Hindu god, like Vishnu. He could then have the power to reincarnate and use different forms to fight against different threats in the wizarding world.
A crossover with Harry Potter could be cool too. Percy could visit Hogwarts and participate in a Triwizard Tournament - like event. He'd be the outsider with his unique demigod powers, and there could be a lot of fun interactions between him and the Hogwarts students, like Hermione being intrigued by his abilities.
A crossover with the Naruto universe is also a possibility. Godlike Gohan could end up in the Hidden Leaf Village. His power would be a mystery to the ninja there. He could help Naruto and the others fight against a new threat, perhaps an ancient evil that was sealed away long ago but has now been released. His energy attacks would be different from the ninja jutsu, and he could teach the ninja some new ways of fighting.
One idea could be that Godlike Broly crosses over into the Dragon Ball Super universe and challenges Goku and Vegeta at their peak forms. His overwhelming power could force them to seek new power - ups and training methods.
Maybe Naruto's godlike status makes him a target for various factions in different crossovers. In the One Piece world, female pirates could be part of his harem as they see his power as a means to achieve their own goals, and along the way, there are adventures and battles to protect his newfound relationships.
One idea could be that Harry uses his magic to help the Avengers in a battle against an otherworldly threat. For example, he could create magical shields to protect the team or use spells to disorient the enemy. Another idea is that the Avengers visit Hogwarts and learn about the magical world. Tony Stark might be fascinated by the magic technology and try to find a way to combine it with his own inventions.
Another idea is that Harry has to face Voldemort in a new way. Since he is a Dragonborn, he can call upon dragons to aid him in the battle. The dragons could be used to attack Death Eaters or to create a distraction while Harry uses his combined wizard and Dragonborn skills to finally defeat Voldemort. Maybe the dragons are attracted to the powerful magic that Voldemort wields and see it as a threat to their territory.
A third plot idea is that fem Harry Potter is actually a long - lost relative of Loki in some convoluted way. This discovery leads to a series of events where they have to work together to uncover the truth about their shared heritage. Along the way, they face opposition from both the wizarding community who fear her newfound connection and some Asgardians who don't trust an outsider.
One idea could be that the Hogwarts students take a field trip to Disneyland. They could be amazed by the magical rides and meet Disney characters. For example, Hermione might be fascinated by the technology behind the rides and try to figure out how they work while Harry and Ron are more interested in the food. Another idea is that Disney villains team up with Voldemort. The Evil Queen could use her magic mirror to help Voldemort find Harry Potter. And Maleficent could use her dark powers to assist in the battles at Hogwarts.
One interesting idea could be a crossover with a fairytale world. For example, Hermione could be transported to a world like Cinderella's and meet a prince who has some magic similar to that in the Harry Potter universe. This would create a new kind of romantic dynamic where she has to balance her Hogwarts knowledge with this new, more traditional fairy - tale romance.
Perhaps the BTS members are magical creatures in the Harry Potter universe. Jin could be a Veela, with his good looks and charm that can sometimes entrance people, much like the Veela's allure in the books. Suga could be a Kneazle, independent and with a sharp mind, able to sense things others can't, just as he often has a unique perspective in his music - making. And they could all be on a quest to find a special magical object that has the power to combine the magic of their world (the BTS world) and the wizarding world of Harry Potter, and along the way, they meet Harry, Hermione, and Ron and form an unlikely alliance.