Halldor Halldor , known as Harald in the Japanese version , is a character appearing in " Yu - Gi - Oh ! 5D ' s " . He is the leader and founder of Team Ragnarok competing in the WRGP . He is the owner of " Odin , Father of the Aesir " and the Ansuz Rune Eye . Overview . Personality . Halldor possesses two completely oppposite sides to his personality . Outside of a duel , he is calm and composed . Inside a duel , he displays anything but a calm exterior , openly showing his emotions . He also tends to be very prideful and haughty during a duel , using " warawa " , which is a phrase of referring to oneself that is usually used by those with status , with his case being Odin ' s chosen duelist . Outside a duel , he is more formal , using " watashi " , a more formal way of referring to oneself . His drastic personality changes in and out of a duel happen almost instantly . Immediately after his duel with Yusei , he calmly congratulated him . Biography . History . When Hallor was a boy , Sebastian told him of his destiny and that Odin ' s eyes will open once he is worthy to wield it . Taking this advice to heart , Halldor spent years travelling the world honing himself to become worthy of wielding Odin . Halldor received his Rune Eye while acting as a military pilot . During a flight , he and another comrade were threatened by the mysterious appearance of clouds . While in the storm , unable to see anything , Halldor ' s Rune Eye appeared and with its power allowed him to see through the storm and prevent his comrade from crashing into mountains by using the rockets from his plane . Because of this , he was called in for wasting the material but quit to follow his interest in Norse Mythology . Long after this event , Halldor began researching about the Norse mythology involving Ragnarok and went on a journey to hone his dueling skills and become worthy to own " Odin , Father of the Aesir " which was in a tree root in a chamber beneath his family ' s mansion . He did as instructed by Sebastian due to his family ' s duty . Halldor then began searching for others who might also have a Rune Eye , with the help of his servant Sebastian . This led him to finding Dragan ' s father who gave him " Thor , Lord of the Aesir " , with the condition of delivering that card to his son . After meeting Dragan , who had survived an avalanche because of the Rune Eye protecting him , Halldor convinced him to use " Thor " . Lastly , Halldor , along with Brodor , traveled to an island where the " Loki , Lord of the Aesir " card was . Upon finding it , Brodor steals it and tries to escape on a boat . As Dragan , Halldor and Sebastian follow after him , Brodor ' s boat crashed against a boulder and sent him flying towards a pillar of rock . However , the final Rune Eye appeared on his eye and a mysterious thunderbolt destroyed the pillar . After the three of them catch up with Brodor , he says that the card is his , which Halldor acknowledges , saying that " Loki " has chosen him . World Racing Grand Prix . Halldor , along with his companions , were on a plane flying towards New Domino City for the WRGP finals . At the same time , the Three Pure Nobles achieved falsification of history . Halldor , along with the others noticed that the Aesir had protected them from the wave . Later , Halldor and his team appeared publicly to host an exhibition Duel against the other teams in the WRGP , where Dragan chose to Duel Jack Atlas . During the Duel , after Dragan Summons " Thor , Lord of the Aesir " and attack s " Red Dragon Archfiend " , the two monster s emit a strange wave of energy while battling . Because the force began to destroy the building , the Duel was called off . Before their match against Team 5D ' s , his comrades witness how the Spiral building is emerging into their world . Yusei Fudo , Jack and Crow Hogan arrive , and Halldor realizes that the Mark of the Dragon allows them to see the building as well . He reveals that they know Team New World are the ones behind the upcoming crisis . Halldor then proceeds to tell them the story behind the Rune Eye , as well as that of the 3 Aesir . After this , Yusei asks him to cooperate with them in stopping Iliaster . However , Halldor reveals that the three Aesir do not wish to ally themselves with the Crimson Dragon because Yusei ' s father had been the one who created the Ener - D reactor , and Roman Goodwin caused Zero Reverse and began all this . Because of this , they believe that Yusei himself also carries a destiny of destruction . Therefore , Halldor declares that the semifinals will decide who fights against Iliaster . When Halldor finally faces against Yusei in the semifinals , Halldor pushes him into a corner as he has all 3 Aesir on the field . Still Yusei , with the power of the Crimson Dragon and " Shooting Star Dragon " , was able to defeat him and with this Team Ragnarok loses and Team 5D ' s proceeds to the finals . After the Duel ends and both duelists get back to the pits , Halldor recognizes Yusei ' s strategy of countering the " Odin ' s Eye " to win the Duel . He then uses his Rune Eye and notices that behind Yusei and " Shooting Star Dragon " is the Crimson Dragon . Halldor takes this as evidence that the Aesir now acknowledge Yusei and his friends as comrades . After Dragan , Brodor , and Sebastian arrive to where he is , Sebastian questions him if they should leave the fate of the world in their hands . Halldor then responds that Yusei ' s fate won ' t bring destruction but instead a road to a brighter future . When the Three Pure Nobles appear to the Signers the day before the WRGP finals , Halldor and his teammates are also present . They explain to Team 5D ' s that the fate of the world lies with them winning the match as that would cause the Divine Temple to disappear . Halldor and his team watch as Team 5D ' s battle and defeat Team New World and later congratulate them on their victory . They also witness the appearance of the Divine Temple . Ark Cradle . Halldor , Dragan , and Brodor appear again on their Duel Runners . Brodor states that theirs were working because they were using the power of their Rune Eyes . Halldor further explains that they weren ' t affected by the negative rotation , implying that the Duel Runners of Team 5D ' s should work because of the power of the Crimson Dragon . Later on , the team speaks with Yusei alone , stating that they will create a path to the Divine Temple . Halldor tells Yusei of the legend of Rainbow Bridge Bifrost , a path that connects the human world with the divine world . He explains that he and his teammates will use the energy of the Ener - D Reactor to create and manifest a path on the Daedalus Bridge . They travel with Yusei and Bruno to the reactor . Connecting their runners to it , the three Summon the Aesirs to increase Ener - D ' s volume and reverse its rotation . Halldor then calls forth Bifrost , creating a path from the Daedalus Bridge to the Divine Temple . As Yusei and his friends travel on the path , Team Ragnarok struggle to maintain the bridge . Eventually , their Valhallander s reach their limits and explode , causing the Aesirs and Bifrost to disappear . He and his teammates are later shown to have survived . When Yusei falls out of his Duel Runner in his fight with Z - one , Halldor notices the Momentum energy heading towards Yusei . He was last seen cheering on Yusei during his duel against Z - one . Decks . Halldor is one of three Duelists who plays a " Nordic " Deck . Specifically , he plays a " Nordic Ascendant " Deck , which is based on lesser gods and beings from Norse mythology , buffered with Trap support . His ace card is " Odin , Father of the Aesir " , the strongest of the three " Aesir " Synchro Monster s .