The film lacks LGBTQ+ characters or any exploration of non-heteronormative identities. Character dynamics focus on the established ensemble without queer subtext.

Gender roles follow traditional Shonen adventure archetypes. While Shizuka offers a female perspective, the leadership and combat roles reinforce standard masculine and feminine tropes.

The cast is largely homogeneous, focusing on fantasy biology rather than human ethnic diversity. The mermaid species serves as a fantasy metaphor rather than addressing real-world racial complexities.

The story promotes environmental stewardship and the protection of undersea ecosystems. It frames cooperation and friendship as universal moral imperatives within a traditional heroic framework.

No significant focus is placed on visible or invisible disabilities. Characters possess standard physical capabilities suited for an adventure narrative without specific disability-driven arcs.