Shu is the owner of the shadow Blue Dragon, which often uses magic sword attacks. In the anime, Blue Dragon at first doesn't cooperate with Shu until their fight with Ivanov and Gustav when Shu managed to gain enough power to control him. For most of the anime, he is quite insulting towards him and constantly criticizes everything Shu does. The Blue Dragon is in fact depicted as having very violent personality, and is extremely cold, not caring about anything or anyone but himself.  (Source: Wikipedia)

As Shu's village was being attacked by an unknown enemy, he and his friends, Jiro and Kluke decide to defend their home. They soon meet warrior Zola and receive the powers of Shadow, an ability that let's them transform their shadow into a powerful monster. Shu receives one of the most powerful monsters, Blue Dragon, and they all set out to defeat their enemy.
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(Source: Anime News Network)

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Cléber Arcanjo de Castro, better known only as Cléber de Castro, is a Brazilian actor, voice actor, dubbing director and lecturer.

After the events of the Blue Dragon series, Shu and Bouquet join a resistance group to fight General Rogi's army of invasion.They encounter a mysterious child , Noi, who has the power to revive Shu's shadow counter-part Blue Dragon, and save her from the pursuit of a red dragon. Now Shu and his company have to set foot once again on a journey to discover the purpose of the dragons, undergo their tests and stop the chains of events which threatens the fate of humanity.
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(Source: Anime News Network)