Gladius operates as an enforcer and punisher for the Chaos Choir, managing field operations and agent communications. He maintains a calm demeanor, often seen with a long-stemmed pipe and an unassuming presence, yet employs ruthless methods to execute orders with merciless precision, concealing serpentine lethality beneath his relaxed facade.

His combat prowess centers on Idwy, a Darkness-attribute Edel Raid manifesting as a sword that unleashes dark energy projectiles. During the Buffalo Festival clash, he overpowers adversaries through superior skill and Idwy’s destructive force. However, synchronized light-attribute assaults from Cou and Ren exploit the weapon’s vulnerability to luminous energy, destabilizing his attacks and forcing his retreat.

Returning to Orga Night’s headquarters, Gladius confronts Grayarts—a former comrade now armed with a light-attribute Edel Raid and crystalline wings replacing severed limbs. Grayarts overwhelms him with a storm of radiant shards, piercing him fatally. Orga Night members later discover his corpse, met with indifference save for Diroy’s muted concern.

In a manga-depicted Nad Lezen mission, Gladius launches an assassination attempt against Cou and Ren. An extended confrontation involving coordinated strikes and elemental vulnerabilities inflicts critical injuries, compelling his withdrawal. His eventual death at Grayarts’ hands persists across narratives, highlighting his role as a formidable yet expendable asset within the factions he serves.