The Narrator in "Ai no Senshi Rainbowman" serves as a conventional expository voice, delivering essential plot details and contextual information throughout the series. This off-screen voice provides continuity between scenes and episodes, clarifying events such as Rainbowman's transformations and the Die Die Gang's schemes. The character functions solely as a narrative device without direct involvement in the storyline or interactions with other characters. Official media adaptations provide no specific backstory, character development, personal narrative arc, origins, motivations, or changes over time for the Narrator. Across the anime series, films, and related spin-off materials, the Narrator's presence remains consistent as an external voice guiding the audience, with no depiction of additional narrative functions or evolution.