Baron Pluto, known publicly as Hideki Meino, holds a high-ranking position within the Inma Empire’s hierarchy, operating beneath viscounts and counts while commanding lower-tier agents. To infiltrate human society, he masquerades as Golden Star Academy’s elite physical education instructor, using this role to covertly surveil students and identify threats.

His physical form sports a serpentine twin protruding from his torso—a common anatomical trait among Inma Lords, such as Count Uranus—though it remains inert during observed conflicts. His signature ability, X-ray vision, enables him to pinpoint concealed Venus symbols etched onto Venus Warriors, exposing their identities as defenders opposing the Inma Empire’s ambitions.

Aligned with the Empire’s agenda, Baron Pluto focuses on resurrecting Apollo, the god of lust, and orchestrating humanity’s subjugation. Preferring stealth over direct confrontation, he deploys his X-ray sight to locate targets for strategic strikes by Inma forces. His collaboration with fellow Inma Lords reflects a rigid hierarchy, with tactics emphasizing psychological warfare and calculated ambushes to destabilize the Venus team. Interactions remain strictly adversarial, cementing his role as a methodical antagonist within the central conflict.