It's not a straightforward yes or no. Raphtalia and Naofumi's depictions in the anime have elements from the manga, but they also have their own unique tweaks and additions to enhance the viewing experience for anime-only viewers.
Raphtalia remains alive. The manga doesn't have her character meet such a fate. Her presence is crucial to the development of the story and she continues to play an important role until the end.
A common theme is growth. Both Raphtalia and the Shield Hero grow in power and character. For example, Raphtalia might start as a weak demi - human but through her adventures with the Shield Hero, she becomes a powerful fighter. Another theme is loyalty. Raphtalia is always loyal to the Shield Hero and this loyalty is often tested in different fanfictions, like when faced with false accusations against the Shield Hero.
One great Raphtalia x Shield Hero fanfiction is 'A New Beginning'. It offers a fresh take on their relationship, exploring how they grow together in a post - apocalyptic setting within the Shield Hero world. The author does an excellent job of character development, especially with Raphtalia, showing her evolving from a shy character to a strong and confident partner to the Shield Hero.
One common theme is friendship. Since they start off with some misunderstandings and conflicts, many fanfics focus on how they build a friendship over time. For example, they might have to work together to face a common enemy, and through that, they start to respect and like each other.
It's hard to say for sure. It might be related to a previous event or a hidden power within Naofumi that triggers this exclusive vision. Maybe it's a twist the author planned to surprise the readers.
One popular 'Naofumi Iwatani' light novel is 'The Rising of the Shield Hero'. It tells the story of Naofumi, who is summoned to a parallel world as one of the Four Cardinal Heroes but is initially ostracized and has to fight against many odds. The story is filled with adventure, character development, and an interesting take on the isekai genre.
One popular 'naofumi x motoyasu fanfic' is 'The Unlikely Bond'. It explores their relationship in a very interesting way, showing how they overcome their differences and start to understand each other better. The character development in this fanfic is really well - done.