the lively and blundering twin brother of Luna. He plays a "Morphtronic"
deck , with transforming monsters that have different abilities in attack and
defense position, and his key card is Power Tool Dragon. During a life-or-death
battle against Aporia, Leo's desire to protect Luna makes him the sixth and
final Signer, with the Mark of the Crimson Dragon's Heart. He also comes into
possession of the true form of Power Tool Dragon, Life Stream Dragon, which is
also a Synchro Tuner monster Yusei can use to summon out his strongest monster,
Shooting Quasar Dragon. Leo's original dub name was going to be Luca, this was
changed by 4Kids.