The Boruto manga is pretty straightforward in its storytelling and avoids filler. It keeps the narrative moving along without including extraneous material that doesn't contribute to the main storyline.
Filler words also play a role in the development of the narrative voice. An omniscient narrator might use different filler words compared to a first - person narrator. The choice of filler words can also change over the course of the novel as the character grows or the situation changes. For instance, a character who becomes more confident might use fewer filler words as the story progresses.
In novels, filler words can also be used for character differentiation. A nervous character might use more 'um's and 'ah's compared to a confident one. They can be a subtle tool for characterization. Moreover, in some cases, filler words can be used to create a regional or social dialect. For example, certain words might be more common in a rural setting's dialogue, which can help to paint a more vivid picture of the world in the novel.
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.