Popo begins as a soldier in the Dark Insect Realm army, commanded by General Scorpion. Tasked with capturing powerful beetles for the Dark Insect Realm's purposes, Popo directly opposes the protagonist fighters.

A pivotal defeat in battle shatters Popo's faith in the Dark Insect Realm's goals and methods. This event triggers a profound shift, leading Popo to defect from the antagonist forces.

Seeking redemption, Popo joins the protagonists. The character actively fights alongside them against the very army Popo was once part of, including former comrades like General Scorpion.

As a beetle fighter, Popo commands a Stag Beetle named Black Kabuto in combat. The character demonstrates a journey from initial antagonism and loyalty to the villains towards a commitment to fighting against them, motivated by a rejection of the Dark Insect Realm's destructive ambitions.