Baron Leltoy serves as the youngest Haos attribute brawler within the Bakugan Battle Brawlers Resistance. His partner is the Bakugan Saint Nemus, and he wields the Bakugan Trap Piercian. Baron sports spiky pink or purple hair, usually covered by a red headband. As the eldest of seven siblings – Biron, Buron, Beron, Boron, Maron, and Miron – Baron shoulders significant family responsibility, frequently caring for his younger brothers and sisters. Space constraints at home lead him to plan moving out, a decision supported by fellow Resistance member Ace Grit. Early in his battling career, Baron grapples with confidence, particularly after losing Blade Tigrerra to Spectra Phantom and Viper Helios. This defeat instills a fear of losing Nemus, impacting his initial performance. Encouragement from Dan Kuso, Mira Fermin, and Nemus himself helps him overcome this fear. He achieves his first major victory against Shadow Prove, capturing three of Shadow's Bakugan. Though often dismissed as the "weakest" or a "newbie" by opponents like Lync Volan and Shadow, Baron proves his capability by defeating three Vexos members: Shadow Prove, Lync Volan, and Volt Luster. He also aids Dan Kuso in battles against Mylene Farrow and Shadow Prove. Baron deeply admires the original Battle Brawlers, especially Dan Kuso. Mira Fermin observes he owns a poster of the team. This fandom sometimes leads to moments of embarrassment in front of his idols, and he frequently uses honorifics like "Master Dan" or "Master Marucho." His enthusiastic behavior occasionally borders on excessive fascination, which Dan finds off-putting. His journey takes him to Earth alongside Dan, Mira, and Runo Misaki to combat Vexos operations. On Earth, he expresses fascination with local customs like bathing. He later returns to New Vestroia using Michael Gehabich's dimension transporter. Key battles include protecting Dan and Drago from Mylene and Shadow in Beta City – resulting in Baron's temporary knockout but successful destruction of their Dimension Controller – and volunteering to face Volt in Gamma City, earning Volt's respect after victory. Baron participates in pivotal events, including receiving the Haos attribute energy from the Legendary Soldiers of Vestroia, triggering Nemus's evolution. He loses this energy to Hydron during an ambush while with his siblings. In a tag-team brawl with Shun Kazami against Volt and Boriates, he helps protect the Ventus attribute energy. Later, he battles inside the Alternative's core alongside Dan, Shun, and Ace, contributing to its destruction and the Vexos' defeat. After these events, he returns to Vestal with Mira, Ace, Gus Grav, and Keith. Baron appears later in a flashback when Marucho reflects on past allies. He uses battle catchphrases like "Kick it!" and "Let it rip." Baron is the only known brawler to use a Bakugan Trap against both Battle Gear and a Neathian Bakugan. He demonstrates practical uses for his gauntlet beyond battling, such as a countdown timer, and is noted as a competent cook. His battle record reflects his growth: losses to Spectra Phantom and Hydron; wins against Shadow Prove, Lync Volan (twice), Volt Luster (twice, once with Shun), and Mylene/Shadow (with Dan); and participation in group victories, including the final battle against Zenoheld.