Otoko is an adult male character, visually defined by his overweight build and constant wearing of sunglasses. He inhabits a science-fiction world structured as a matriarchal society where men face systematic marginalization and are derisively termed "otoku."

Joining the protagonist's party, Otoko contributes to challenging the ruling female group Aurora and combating the societal imbalance against men. His role develops alongside fellow party members Jonjon and Nekketsu. Together, they undertake exploration, engage in turn-based combat reminiscent of classic RPGs, and confront the matriarchal regime governing their world.

Details regarding Otoko's background prior to joining the party, specific personal development throughout the narrative, or expanded storylines in other media remain absent. His known involvement is central to the conflict against Aurora and participation in the party's objectives within this setting.