Ader (alternatively documented as Adder or Passer) stands as the primary antagonist. He denounces Popo's father as an enemy of the forest people, holding him responsible for the forest's afflictions. His actions directly instigate the protagonist's journey when, during an ominous mist event, he transforms Popo's mother into a half-plant, half-human creature. Commanding henchmen and giant beetles, Ader actively obstructs Popo's quest to find his father and save the forest. His core motivation involves desperately seeking to prevent Popo from discovering his destined role as the next Guardian of the Forest. Throughout the narrative, Ader orchestrates conflicts by deploying relentless beetle attacks against Popo and his allies. Information regarding his background, origins, or development is confined to this described antagonistic role opposing Popo's mission.