Description
Mario, Julio, and Serio Renato are siblings featured in *Gundam Build Fighters: Battlogue* Episode 4, "Our War," operating as the Renato Brothers team. Mario and Julio are twins, with Mario being the eldest son. Serio is their younger brother, eight years their junior. Despite his youth, Serio possesses a brighter, more expressive personality than his older siblings, though all three share a deep passion for Gunpla battles. Serio appears older than his age, has darker skin, sports a thicker goatee than his brothers, and parts his hair on the left like Julio. Julio parts his hair on the right.

Mario serves as the team's taciturn and calm Gunpla builder and tactical planner, demonstrating exceptional strategic insight. He is the more skilled twin, capable of scolding Julio for impatience and excelling in both support and combat roles. Julio, the younger twin, primarily pilots the Gunpla during battles, relying on Mario's strategies and equipment.

In their depicted battle, they pilot customized mobile suits built by Mario: Mario uses a GNX-611T/G Striker GN-X, while Julio and Serio pilot GNX-803T GN-XIV units modified for jungle deployment. Employing a tactical theory based on the Chinese proverb "heaven, earth, and man," they role-play as military operatives on a forest stakeout using customized 1/144 pilot figures, aiming to ambush a transport container they believe belongs to Celestial Being.

Their attack reveals a Cherudim Gundam SAGA hidden within, shearing off Serio's GN-XIV left arm. Later confronting a massive PG-scale Gundam Exia, Serio's unit suffers further damage, losing its remaining arm. Mario devises a plan: Julio donates one arm from his GN-XIV to Serio, enabling all three units to activate the Trans-Am system for a coordinated assault. Mario sacrifices his Striker GN-X by detonating it at close range to destroy the Gundam Exia's cockpit, securing victory. Discovering their opponent was Meijin Kawaguchi (Tatsuya Yuuki), they express frustration that his oversized Gunpla disrupted their vision of a "realistic war," demanding an apology.

The brothers are characterized by their shared obsession with recreating war-like scenarios in Gunpla battles, emphasizing tactical realism and teamwork, evident in Serio's eager shouts upon encountering Meijin Kawaguchi.