In some Naruto nature manipulation fanfiction, there are concepts like nature manipulation being used for non - combat purposes. For instance, using earth nature to build amazing structures in a short time, or using wind nature to create beautiful and useful air currents for transportation or energy generation. It adds a new dimension to the idea of nature manipulation that is not just about fighting.
One interesting concept could be the discovery of new and rare nature types. For example, a fanfic might introduce a nature type that combines lightning and water in a unique way, creating a whole new set of jutsu possibilities. Another concept could be characters who have an abnormal ability to manipulate multiple natures simultaneously, which goes beyond what we see in the original Naruto series.
A cool concept in Naruto nature manipulation fanfiction is the idea of transferring nature manipulation abilities. Maybe a character finds a way to transfer their fire nature manipulation to another character who previously had no such ability. This could lead to all sorts of interesting storylines, like the new wielder struggling to control the power or using it in unexpected ways.