Some characters might be flattered. For instance, Rem would probably be happy to see positive portrayals of her loyalty to Subaru. Others, like Roswaal, might be intrigued by the different theories and storylines in the fanfic that revolve around him.
Yes, indeed. The Re:Zero manga exists and presents the story in a graphical format. It might have some differences from the original source, but it still captures the essence and excitement of the series.
The older characters such as Kakashi would be cautious. They would recognize Naruto but also be worried about the implications of someone from the future being in the present. They would want to know if his presence could change the future in a negative way. For example, they might fear that his actions could lead to the earlier awakening of a powerful enemy. As for the villains, they might see future Naruto as a threat and try to eliminate him as soon as possible. Orochimaru, for instance, would be very interested in Naruto's future powers and might try to capture him to study. And the new generation of ninja in the past would look up to future Naruto, seeing him as a symbol of what they could become.
The 're zero rem love novel' is significant as it expands on the Re:Zero world. Rem's love in the novel is a key element that drives her actions. It shows how she develops feelings for Subaru, and this relationship is a major part of the overall narrative. The novel can explore her emotions and internal struggles in a more detailed way compared to other mediums.
The light novel's ending is crucial as it ties up many plot threads. It gives a sense of closure to the characters' arcs. For example, Subaru's growth throughout the story reaches a culmination in the ending. It also reveals the final fates of other important characters like Emilia, showing how their relationships have developed and changed over the course of the series.