One way is to use descriptive language to flesh out settings or events. For example, describe the scenery in detail or elaborate on a character's thoughts and feelings during a moment of downtime. Another approach could be to introduce minor conflicts or challenges that don't have a major impact on the overall story arc but add some variety and tension.
A filler story's length is unpredictable. It could be as short as a single installment or as long as a series of related episodes. The main factor determining its length is often the creative decisions made to maintain audience engagement or bridge storylines.
One cool Naruto fanfiction could be about a new character with a rare bloodline introduced during a filler arc. This character might have the power to control shadows in a unique way, different from Shikamaru's. The story could revolve around their journey to master this power and how they interact with the main Naruto characters during the filler events.
To cut filler, analyze each chapter or section. If a part doesn't move the story forward, doesn't develop characters, or doesn't add depth or tension, it's likely filler. Be ruthless in eliminating these.
Well, one way to do it is to describe the world-building in more detail. Maybe talk about the history of the fantasy world, its customs, or introduce some side characters and their own little adventures. Another approach could be to have the main characters take a break and have some light-hearted moments that don't directly advance the main plot but show their personalities and relationships. But be careful not to make the filler too long or it might bore the readers.