Manbō-shun personifies the endangered ocean sunfish within a thematic series. This character features in the 2020 ONA, one representation among over 3,000 depicted endangered species. Consistent with the series' dialogue-less format, Manbō-shun conveys meaning solely through actions and visual storytelling, relying on observational understanding of animal behaviors.

The character originates from Yūki Odaka's concept of personified endangered species. Manbō-shun exists within an ensemble including counterparts like Shirokuma-shun (polar bear), Zо̄-shun (African elephant), Rakko-shun (sea otter), and Ishikawa-Gaeru-shun (Ishikawa frog), each embodying specific conservation concerns through their species traits and habitats.

Official media presents Manbō-shun in episodic segments exploring the daily challenges endangered animals face. These concise 6-minute installments focus on environmental interactions and survival contexts, highlighting species-specific behaviors rather than traditional character arcs or development.

Manbō-shun functions as an educational representation within the series' framework of species conservation awareness. The character's thematic significance draws directly from the real-world vulnerable conservation status of the ocean sunfish (Mola mola), illustrating threats like habitat loss, overfishing, and marine ecosystem degradation without explicit exposition.