August Claudius Lucius is a prominent royal from the kingdom of Sunburst. He travels Teslandia with Marius, collecting Tokens for Sunburst's benefit. Augusto maintains a formal, calm, and courteous demeanor in interactions, showing respect even to those of lower status like Marius, acknowledging him as a fellow Beyfighter. This politeness coexists with a pronounced sense of superiority and occasional conceit, particularly towards individuals from other nations. He is driven by the firm conviction that Sunburst should rightfully govern Teslandia due to its namesake, reflecting deep loyalty to his kingdom and belief in its dominance.

His background as Sunburst's young ruler and the legacy of his late father shape his worldview and contribute to his tendency to look down on others. Augusto holds strong principles regarding justice and order, demonstrating marked intolerance for those who violate established laws. This manifests when he confronts Gai from the Stone kingdom for defying summit decisions. Augusto frames their subsequent confrontation not as mere competition but as necessary "punishment," declaring Gai's actions a disgrace to Beyfighters and demanding atonement.

In battle, Augusto commands the Cyborg Warrior Sabre Lion, noted for comprehensive excellence in raw power, agility, defense, and stamina. Sabre Lion possesses distinct capabilities: a powerful roar generating shockwaves capable of incapacitating heavy-weight opponents like Minotaurus, sharp claws for close combat, and long-range attacks such as emitting beams of light from its palms to stun adversaries or counter flight-types. Sabre Lion executes named special moves during battles, including "Cross Sun Sword." His victory over Gai and the Iron Minotaurus secured a Token for Sunburst.