Hakuou is perceived as an intelligent duelist with a strong winning streak. He has a habit of holding back in order to toy with his opponents until he has one or two shields remaining before taking things seriously and twist everything around with a single turn.

(Source: Duel Masters Wiki)

The 1st Duel Masters series. 
 
A mysterious organization is interested in fledging duellist Shobu Kirifuda's ability to bring Duel Master creatures to life. With the support of his friends, Shobu duels with passion, discipline, and heart as he strives to be like his father and become the next Kaijudo master.
 
(Source: Anime News Network)


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The 2nd Duel Masters series. 
 A mysterious organization is interested in fledging duelist Shobu Kirifuda's ability to bring Duel Master creatures to life. With the support of his friends, Shobu duels with passion, discipline, and heart as he strives to be like his father and become the next Kaijudo master.

Shobu and friends continue to face the members of Fua Duelist in the world championship and defeat them all and now Shobu is the world champion. 
Before Shobu could relax he is being called into the creature world to face Diabolos Zeta, Temporal Ruler, who is about to bring annihilation. Shobu and friends gather the new legendary cards and stop him with their new powers of these cards.

Shobu and friends fight the remaining Fua Duelists in order to defeat Zakira. Once again, they face off against the old members of Fua Duelists at the World Championship tournament.
 
Shobu also found the terrible fate his friends faced because of these duelists in their past.