Fluder Paradyne is the Imperial Court Wizard of the Baharuth Empire, holding simultaneous roles as headmaster of the Imperial Magic Academy and overseer of the Ministry of Magic in Arwintar. Acknowledged as the Empire's most potent wizard, his power rivals that of the legendary Thirteen Heroes. Originally from Belmous Village, his fascination with magic began upon meeting a magic caster there. A pivotal journey to Eryuentiu, where he was denied a magical artifact, ignited lasting jealousy toward the Thirteen Heroes and a fierce ambition to surpass Rigrit. An imperfect immortality ritual later slowed, but did not stop, his aging.

For six generations, Fluder served the imperial family. Initial tensions eased over time, leading him to tutor emperors in politics during the third and fourth generations and rise to head magician. He orchestrated the multi-generational centralization of imperial power. Historical accounts credit him with shielding the Empire from monsters and calamities. His ongoing magical research includes controversial ventures, notably employing undead as labor for grid farming—a practice opposed by priests as blasphemous. Intrigued by a Death Knight encountered in the Katze Plains, he captured it for study, though repeated control attempts proved futile.

Fluder maintains a polite yet reclusive manner, showing scant interest in politics or society. His defining characteristic is an obsessive passion for magic, which supersedes all other concerns. This obsession manifests as extreme selfishness; he will sacrifice anyone, including the imperial family, to further his magical comprehension. His deepest yearning is to witness the "abyss of magic" and attain greater power. He harbors envy toward younger individuals, perceiving their potential to reach magical heights he cannot achieve in his remaining time.

Learning of Ainz Ooal Gown, a magic caster rumored to equal his strength, Fluder eagerly anticipated a magical discourse with this potential peer. This fascination deepened during an encounter with the adventurers Momon and Nabe. Upon sensing Momon's suppressed capacity for tenth-tier magic after they revealed their true power, Fluder prostrated himself, declaring Momon the true God of Magic and desperately begging to become his disciple. He pledged absolute loyalty and offered all his resources in exchange for knowledge.

Complying with Momon's demand for sacrifices, Fluder deceived Emperor Jircniv. He falsely claimed to have located Ainz Ooal Gown's dwelling by observing Carne Village, prompting Jircniv to commission workers to explore "newly discovered ruins." This manipulation triggered the invasion of Nazarick. Fluder later witnessed Mare and Aura's arrival in the imperial capital demanding an apology for the tomb's invasion.

After Jircniv uncovered his betrayal, Fluder's lands were confiscated and his privileges incrementally revoked, though he retained his position as head magician. During a subsequent meeting with Ainz in his residence, Fluder reported steady progress documenting the Empire's intelligence on neighboring nations. He acknowledged his waning influence and suspected Jircniv knew of his treachery. Ainz rewarded him with the Book of the Dead and offered a future role in the Sorcerer Kingdom's magical research division, instructing him to remain in the Empire temporarily to ensure stability. Fluder later provided Ainz with intelligence concerning the Martial Lord and Death Knights.

Tasked by Ainz with gathering intelligence on the Dwarf Kingdom's runes, Fluder shared limited details: the kingdom endured a dragon attack, its ruler is a runesmith, and dwarves previously visited the Empire. He confirmed weapon and armor purchases occurred a century prior, noting all runic magic items from that exchange are now lost.