Rua" Lua "Leo

Lua, along with his twin sister Luca, aid Yusei Fudo and Team 5D's. They both look up to Yusei and see him as a hero. The twins care deeply for each other despite their bickering and would do anything for each other. Together they live in the Tops, mostly by themselves as their parents are always on business trips. Lua is the older twin and spends much of his time looking out for Luca. Although he is young, he runs into harsh duels without hesitation and with complete bravery. Lua is lively, loud mouthed, and a blundering boy. He is often the comic relief of team 5D's, he is often cracking jokes and acting like a goofball. However, he loves Luca with all his heart and would give absolutely anything to protect her despite never being of much use. Jack Atlas is his biggest inspiration and he wishes to be just like him when he grows up.

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In his duel against Aporia, on the brink of death, Lua awakens as the sixth Signer, possessing the Heart mark of the dragon. His Signer dragon is Life Stream Dragon.

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In the manga, he seems to be influenced by a Card of Darkness and works as a duel assassin under Godwin. He rides a D-Wheel shared with Ruka, who is seated behind him. He holds the manga equivalent of Power Tool Dragon.