The show contains occasional mild fan service, such as suggestive camera angles or characters in revealing outfits, but lacks explicit sexual content. There are very rare instances of romantic tension, but it remains very subdued throughout the series.

The series features frequent ninja combat, which includes realistic portrayals of impalement, blood splatter, and fatal injuries. These intense battle sequences are a central component of the show and can be quite graphic at times.

Language is generally mild but includes words like "d*mn", "h*ll", and "b*stard", typically used to express frustration or aggression during intense conflicts. The usage is infrequent, appearing sporadically throughout the hundreds of episodes.

There are recurring scenes involving adult characters drinking alcohol in social settings or at bars. Additionally, one prominent character is frequently depicted smoking cigarettes, though drug use is not a focus of the plot.

The series includes many dark and psychological themes, including the death of beloved characters, traumatic backstories, and menacing supernatural entities. These moments are designed to be emotionally heavy and can be quite unsettling for younger viewers.

Emphasis is placed on perseverance, the importance of fostering strong social bonds, and the responsibility of protecting one's community.

Protagonists demonstrate resilience and growth, consistently choosing self-sacrifice and integrity over personal gain when faced with adversity.

Characters possess distinct cultural identities and varied skill sets within a fictional world, though gender roles can occasionally lean into traditional tropes.

Offers insights into teamwork, conflict resolution, and the long-term consequences of one's decisions.