Reigen survives throughout the manga. The story doesn't involve his death. The plot focuses on his adventures and interactions without that tragic event.
I'm not sure of the exact significance of '23 percent' in it. It could be an arbitrary number the author chose to mark a certain part of the fanfiction.
Reigen does have powers in the manga, but they are often presented in a more subtle and unique way. His abilities might not be straightforward combat skills but could involve manipulation or perception.
In the manga, Reigen doesn't have powers. His charm and appeal come from his down-to-earth nature and the way he navigates the supernatural world without relying on extraordinary abilities.
Well, one characteristic is the blend of different universes. Since sans and reigen are from different fictional worlds, fanfics often play with the idea of how these two very different worlds collide. For example, in some, the magic or powers from each world interact in unique ways.
A common theme is friendship. Their relationship is often explored in depth, showing how they rely on each other. For example, in many fanfics, mob looks up to reigen for guidance.
One great toby fox reigen fanfic is 'The Unlikely Duo' which combines the unique styles of Toby Fox's creations and the character Reigen in an exciting adventure. It has a well - paced plot and interesting character interactions.