A fanfiction with godlike Harry Potter and Ulquiorra would likely involve a lot of power dynamics. Harry, with his enhanced abilities, could be seen as a disruptor in Ulquiorra's world. Their interactions might not only be about physical combat but also about ideological differences. For example, Harry's values of friendship and loyalty could clash with Ulquiorra's more detached view of the world. It could also explore how their powers interact, like if Harry's magic can affect Ulquiorra's spiritual form, or vice versa.
A plotline could involve a great evil that threatens both of their worlds. Harry Potter, with his godlike powers, and Ulquiorra, with his own formidable abilities, are forced to work together. Along the way, they have to overcome their differences and learn to trust each other. They might also discover that the source of the great evil has something to do with a misused or corrupted form of the power that Harry has.
A fanfiction with Harry Potter dressing as Ulquiorra could start with Harry being curious about different forms of power and personalities. He discovers Ulquiorra's character from some magical source. As he starts to dress and act like Ulquiorra, he finds that his own magic is affected in strange ways. His Patronus might change in appearance or his spellcasting could become more precise yet colder. He would also face challenges from the wizarding community who don't understand his new guise, but at the same time, he might attract the attention of some dark forces who mistake him for someone with new and dangerous abilities.
A possible plot for this fanfic could be that Orihime is a transfer student to Hogwarts, and Ulquiorra is a mysterious being lurking in the Forbidden Forest. Orihime's kind heart leads her to try and befriend Ulquiorra. As they interact, they start to change each other. Orihime might make Ulquiorra more empathetic, while Ulquiorra could teach Orihime to be more self - reliant in this dangerous magical environment.
Well, it could be a story where Harry Potter, with his magical skills, enters the Stargate universe and becomes a godlike figure. Maybe he uses magic to solve problems that the Stargate teams usually face, like dealing with the Goa'uld in a unique magical way.
It could be an old wizard who has been living in seclusion for centuries, perfecting his smithing skills. He might emerge during a time of great need in the wizarding world, like when Voldemort was at his most powerful.
Well, he'd probably be extremely powerful. He could use his magic to do things that would astonish even the mightiest of Marvel heroes. Maybe he could magically enhance his physical abilities like super strength or speed, just like he does with spells in the Potterverse. And his knowledge of magic could give him an edge in battles, being able to conjure up powerful shields or offensive spells that are unique in the Marvel universe.
In RWBY fanfiction, a Godlike Harry Potter might possess extraordinary magical abilities far beyond what's seen in the original Harry Potter series. He could use his magic to effortlessly defeat Grimm, perhaps with a single spell. His presence would likely disrupt the power balance in the RWBY world, as his knowledge of advanced magic could give him an edge in battles and problem - solving.
Another possibility is a group of pure - blood supremacists. They would see Harry's new 'look' inspired by Ulquiorra as a threat to their traditional wizarding ways. They might try to undermine Harry and his friends, seeing his new form as a symbol of chaos and deviation from the norm.
In this fanfiction, the plot could start with a strange magical phenomenon that causes Harry Potter to be reborn as Ulquiorra Cifer. He initially struggles with his new form and the cold, emotionless nature that comes with being Ulquiorra. However, as he gets used to it, he starts to use his wizarding skills in the Bleach world. He could use spells to enhance his combat abilities as Ulquiorra. The story might then lead to a great battle where he has to face a powerful enemy that is threatening both the magical and spiritual worlds. Along the way, he might also meet some characters from the Harry Potter series who have also been transported into the Bleach world in different forms, and they have to work together to save both universes.
It would be really wild. Maybe Harry Potter would have some of Ulquiorra's powers like his cero blast, but in the form of a wizard spell. Or perhaps he would have Ulquiorra's cold and emotionless demeanor in the wizarding world, which would be a huge contrast to his normal self. He could be dressed in a way that combines the Hogwarts robes with Ulquiorra's Arrancar outfit.