Dufaux (known as Dufort in the English adaptation) serves as Zeon's bookkeeper. He is exceptionally quiet and reserved, almost devoid of emotion, and possesses psychic powers.
Dufaux’s background was shrouded in mystery until he shared his tale with Kiyomaro and Gash towards the conclusion of the Faudo saga. The narrative diverged notably between the manga and anime versions.
In the anime, Dufaux recounted having formidable psychic abilities, which led to his confinement in an asylum where he endured experiments and possible abuse for most of his life. His hatred towards humanity for these past injustices caught Zeon's attention, who then freed him from the asylum.
The manga presented a slightly different story: Dufaux was sold by his mother to a mad scientist for ten thousand dollars. Throughout his childhood, he underwent numerous mental and emotional experiments, culminating in his liberation and the destruction of the lab located at the North Pole. After surviving in the harsh Arctic conditions, he met Zeon, who made him his bookkeeper.
Additionally, the manga revealed that Dufaux has an ability called "Answer Talker," enabling him to understand any attack and how to defend against it. This power activates when someone dies and returns to life, such as Kiyomaro after being killed by Riou and revived within Faudo tower.
While Dufaux's fate remains unresolved at the end of the anime beyond his escape from Faudo, in the manga, he wanders off after Zeon departs, seeking purpose after years of exploitation. Eventually, he uses his "Answer Talker" skills to assist others, acknowledging the impact Zeon and Gash had on him. Later, he helps Kiyomaro develop and control his own Answer Talker ability in preparation for battling Clear Note. Utilizing his abilities, Dufaux assessed each mamono's training needs during the lull while Clear recovered.
In the original Japanese version, Hikaru Midorikawa voices Dufaux, whereas Dave Wittenberg provides the voice for Dufort in the VIZ Media dub.
(Source: Wikipedia)

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