Roberto Luis, biological son of the late Germán Luis and Ximena Luis, entered the world after his father’s demise, nurtured during the Valiante Kingdom’s restored peace. Under his mother’s care and bolstered by allies—including León Luis, his stern half-brother—Roberto endured relentless training from childhood to inherit the Zoro armor as a Makai Knight. Though drilled in dual-sword combat, his compassionate temperament clashed with the path’s harsh demands, his tears during sparring sessions sparking doubts about his readiness for the knightly mantle.

His abduction by masked thralls, puppets of the Horror Nigra Venus, ignited a chain of events to exploit him as a living key. Their goal: sacrifice him to awaken Zirkel’s Ring, a relic poised to tear open a portal to the Makai realm. The crisis summoned Germán’s ghostly resurrection through Garm’s power, enabling the fallen knight to guide rescuers to his son. In the ensuing clash, Roberto’s survival became the linchpin to thwarting Nigra Venus and its collaborator, Dario Montoya.

The aftermath unveiled Roberto’s true parentage as Germán, having shielded him through a second sacrifice, vanished once more. This truth anchored Roberto to a legacy of sacrifice and duty, reshaping his perception of the Makai Knights’ burden and his place within their shadowed order.