A Naruto OC painter can contribute by creating art that has a hidden message or a map leading to some important place or object. This could drive the plot as the main characters search for the meaning of the painting or the location it points to. For example, it could lead to a hidden cache of powerful weapons or a secret training ground.
The OC painter can be a key figure in a fanfic's plot in multiple ways. They can use their paintings to record important events or prophecies. For instance, if they paint a vision of a future disaster, the characters in the fanfic would then be spurred into action to prevent it. Also, the painter could be kidnapped by an enemy because their art is believed to hold some sort of power or valuable information. This would set off a rescue mission and a series of events that would move the plot forward. Moreover, the painter could create portraits of characters that have some sort of magical or psychological effect on the people in the paintings, which could lead to all sorts of interesting plot developments.
Well, an OC painter can add depth to the fanfic's plot in many ways. Imagine if the painter has the ability to paint memories. They could be used to uncover forgotten secrets or solve mysteries in the Naruto world. Their art could also act as a form of communication between different ninja clans or villages. For example, a painting could be a peace offering or a declaration of war. In addition, the painter could be a mentor figure to a young ninja who has an interest in art but also has potential as a powerful fighter. The painter could teach the young ninja how to use art in combat, like creating decoys or distractions through paintings, which would be a new and exciting aspect to the plot.