Leo

Lua along with his twin sister Luca, aid Yusei Fudo, whom they adore and support in his duels while making fun of fate. Lua is the older twin. He is lively and blundering.

Characters biography
Lua lives together with Luca in the Tops resident area. They spend most of their time alone together as their parents are usually at work. They are educated via the internet, so they spend most of their time inside.

Luca was randomly selected as someone to participate in the Fortune Cup. Since she didn't feel like participating, Lua planed to disguise himself as her and participate.

Luca was able to sense Yusei, when he was shocked by the police officers. The two of them rescue him his duel with Ushio and take him to their home. Yusei wants to leave feeling like he's putting them in danger. But Lua talks him into a Duel. After Yusei wins, they manage to get him to stay for the night.

Lua and Luca awake the next morning to find that Yusei had left after modifying their Duel Disks to fit their small arms. Lua then leaves with Tenpei to find and duel the Black Rose Witch, and eventually meets up with Yusei again. Soon, the Witch appears, but leaves after seeing Yusei's Dragon's Birthmark, which disgusts her. Lua demonstrates fear for both the Witch and the Birthmark, as a shot of one of the dragon's claws is seen.

The next day, Lua enters the Fortune Cup in disguise as Luca, but quickly loses to Bommer after a hard-fought duel. However, using Akutsu's Signer-detecting technology, Jeager determines that Bommer dueled Lua instead of Luca.

Deck
Lua plays a Deformer Deck that features an Archetype of monsters known as "Deformers" whose effects are dictated by Battle Position. The monsters' appearances are derived from various objects such as mobile phones, lighters, and magnets.