Blue Hakaider, a key member of the Hakaider Squad alongside Red and Silver Hakaider, operates as a ruthless enforcer under Gill-Hakaider’s command. Engineered to eradicate obstacles to their creators’ ambitions, he balances unwavering loyalty to the squad with a chilling affinity for brutality. His signature weapon, a magnetic whip crackling with 50,000-volt discharges, serves as both a tool of interrogation and a means to relish tormenting foes or underlings. Despite this sadistic streak, he fosters a pragmatic bond with his fellow Hakaiders, prioritizing collective efficiency.

Functionally adaptive, Blue Hakaider carries an egg-shaped regeneration capsule enabling swift repairs mid-combat. His transformation into a Blue Crocodile mode grants serrated, projectile-firing jaws and corrosive digestive acids for visceral engagements. A nuclear-powered motorcycle amplifies his threat, roaring at 600 km/h with a front-mounted rocket salvo. Alongside his squadmates, he merges into the composite war machine Gattaider during pivotal battles, leveraging combined strength to overwhelm adversaries.

Narratively, Blue Hakaider pursues objectives like capturing Akira—a child pivotal to activating the Armageddon Lord superweapon—while clashing repeatedly with resistance figures Jiro and Ichiro. These skirmishes escalate into city-shaking confrontations, underscoring the squad’s role as relentless enforcers. Their allegiance drives them to self-destructively shield Gill-Hakaider’s retreat, though SHADOW later reconstructs them to resume hostilities. Their ultimate demise comes when Jiro, breaking free from manipulation, annihilates them during the collapse of Gill-Hakaider’s conquest ambitions.