I'm not sure specifically as there could be many different interpretations in RWBY King of Grimm fanfiction. It might be about a character who becomes the king of the Grimm, perhaps exploring their powers, their relationship with other characters in the RWBY universe, and how they rule or interact with the Grimm hordes.
The main theme of 'nightmare alley novel' is often about the dark side of human nature. It shows how people can be driven by greed, ambition, and the desire for power. The characters in the novel often find themselves in a downward spiral due to their own vices.
The main theme is often about the harshness of the world. It shows that life can be difficult and full of challenges, as the characters in the story face many dark and trying situations.
The 'Lion King Nightmare Story' could be about a really bad or disturbing version of the Lion King's story. Maybe it involves Simba having some truly horrible experiences that are different from the original. For example, Scar could be even more evil and do things that are much worse to Simba and the pride.
Since it's a fanfiction, it could vary a great deal. But likely, it would include some of the main RWBY characters like Ruby, Weiss, Blake, and Yang. Maybe there's a new character who is the so - called 'King of Grimm' that they have to face or interact with.
The 'A Midsummer's Nightmare' manhwa is about a protagonist who gets caught up in a strange and dreamlike world. The theme could include exploration of the subconscious and the power of imagination. There are also likely elements of facing fears and finding one's true self.
Most likely Simba would still be one of the main characters. Since it's related to the Lion King, he is central to the story. Scar would also be important as he is often the antagonist in Lion King stories.
The theme of the movie King Kong was the friendship and conflict between humans and extraterrestrial life. The movie was about an orangutan named King Kong who was discovered by an anthropologist and brought back to the zoo for research. King Kong gradually adapted to human society because of human rearing, but he was also threatened and hurt by humans. At the end of the story, King Kong established a friendly relationship with humans, expressing the possibility of establishing a friendly relationship between humans and extraterrestrial life. At the same time, it also explored the relationship between humans and animals.