Well, Harry Potter might be really confused at first. Lovecraft's works are full of cosmic horror and a very different kind of magic compared to the magic in the wizarding world of Harry Potter. He would probably be shocked by the dark and often nihilistic themes in Lovecraft's fanfiction.
Definitely 'The Call of Cthulhu'. It has influenced so many horror works since its release. It creates a sense of dread about things that exist beyond our understanding. 'At the Mountains of Madness' is also high on the list. It not only has a great horror element but also a sense of exploration and discovery of things that should have been left alone. 'The Dunwich Horror' is another notable one, with its story of a strange family and the dark forces they seem to be associated with.
The plot could change drastically. Harry might become more paranoid about the unknown threats in his world. He could start seeing potential Lovecraftian - like entities in the Forbidden Forest or in the shadows of Hogwarts. This new - found fear could make him more hesitant in his adventures and less likely to jump into dangerous situations without more information.
The Royal Game of Ur story is really fascinating. This ancient game was discovered through archaeological excavations. It gives us a glimpse into the past. The pieces used in the game were carefully crafted. The rules were designed in a way that required strategy. It was probably a game that brought people together, whether for friendly competition or more serious contests. It shows that people in ancient Mesopotamia had a love for games and strategic thinking, much like we do today. It was a significant part of their leisure activities and might have also had some religious or superstitious connotations.
One of the main themes could be friendship. Just like in many anime, characters in 'ur anime story' might rely on each other, support one another through difficult times, and grow stronger together.
He might save it through his character development. Naruto grows from an outcast to a hero. Incorporating his journey in your fanfiction can inspire the other characters and add a positive, motivational element to the plot. For instance, if your fanfiction has a character going through a tough time, Naruto's story can show them how to overcome difficulties. Also, his relationships, like his friendship with Sasuke, can be used to build complex and interesting character dynamics in the fanfiction.