Ken Kaido commands the Mazinkaiser SKL super robot alongside Ryo Magami as a pilot within Skull Force's elite Death Caprice Squad, operating under the codename "Amon 6" derived from the demon Amon.

His personality burns hot-blooded and aggressively vulgar, declaring battle as his sole reason for existence. Kaido champions a philosophy of absolute conflict resolution: any obstacle, divine or demonic, must be cut down or shot. This drives his role as Mazinkaiser SKL's primary close-quarters combatant, specializing in brutally wielding its massive Ganzantou blade and employing knives for ranged attacks.

Kaido engages enemies directly outside the mecha, demonstrating peak human physicality by sending large opponents flying with single blows and enduring severe punishment. Piloting Mazinkaiser SKL demands exceptional resilience, as activation subjects him to excruciating hellfire that killed previous pilots.

On quarantined Machine Island, Kaido battles three warring factions—Garan Army, Kiba Army, Hachiryokaku—to prevent a planetary catastrophe caused by an unstable gravitational barrier. His actions include infiltrating enemy strongholds, dueling faction leaders like Garan in personal and mecha combat, and coordinating assaults with Magami. Though the mission requires deactivating reactors powering the barrier, Kaido consistently prioritizes annihilating enemy forces through direct confrontation, fighting purely for the sake of battle itself.

His partnership with Ryo Magami balances Kaido's aggressive blade focus against Magami's ranged specialization, united by their shared nihilistic drive for combat.