Gurimaru acts as the guardian beast of Inaco, identifying itself as a griffin cub. This character exhibits a pink, feline-like form with wings, though its precise species remains unconfirmed. Gurimaru's gender is ambiguous and treated as a secret within official media.

Functioning as a magical familiar, Gurimaru's powers activate through the energy of love. Channeling this love energy allows Gurimaru to perform magic. A distinctive verbal trait involves ending its speech with the suffix "-rin." Despite its fantastical nature, characters within the narrative react to encounters with Gurimaru as commonplace occurrences, displaying no particular surprise at its appearance or ability to communicate.

During narrative events, Gurimaru's magic sometimes causes comedic mishaps. One documented incident in a hot spring setting resulted in a magical misfire that displaced several individuals from the baths, triggering a chaotic scene involving unintended nudity. Gurimaru consistently fulfills the role of series mascot across all appearances.

Information regarding Gurimaru's origins, pre-series history, or character development throughout official media is absent. Narrative arcs focusing on personal growth or background exploration for this character are not present in available materials. Merchandise reflects Gurimaru's mascot status, including items such as plush toy key holders featuring the character.