Ze Stron is a male agent in the Ocean Empire's military, operating under Captain Ze Stronestro alongside his partner, Ze Stroger. He possesses the distinctive blue hair characteristic of Water World Men and constantly wears Cool Shades to manage light sensitivity developed over centuries of underwater existence. As an operative, he conducts espionage against surface vessels, notably infiltrating the survey ship Kairyumaru with Ze Stroger during a submarine attack, taking its crew hostage.

Ze Stron is a dedicated Gun Nut with a keen interest in firearms collection, actively attempting to acquire Susumu Oki's modified Type 99 rifle during their initial encounter. He demonstrates confidence under pressure, challenging Susumu's firearm threat during an interrogation aboard the Kairyumaru by calling his bluff, certain Susumu lacks the resolve to shoot.

Ze Stron holds covert loyalty to Queen Ze Violencia, forming a Double Agent trio with Ze Stroger and Ze Stronestro within Hell Deathbird's regime. This allegiance drives their participation in a coup attempt against Deathbird after he usurps power and imprisons the Queen; their sabotage proves pivotal during the final assault on Deathbird's flagship.

His partnership with Ze Stroger evolves into an Interspecies Romance subtly woven through the narrative. This union establishes a lasting legacy, depicted in an epilogue set 30 years later where their descendants command a space-faring SS-99 crew alongside descendants of Susumu Oki, symbolizing reconciliation between surface dwellers and Water World Men.