Kogou is the commander of Demon Lord Ariel's Third Demon Army. 

Duston is a member of Chaldea Security Organization in Fate/Grand Order.

Duston was a physicist who studied cosmic rays and worked on particle accelerators, scraping by to make ends meet. He was recruited by Marisbury Animusphere as an engineer for Chaldea fifteen years prior to the destruction of Chaldea at the end of 2017. Skeptical of Marisbury's words, he eventually agreed to take the position due to Marisbury's passion and earnestness for the project.

Duston has a dislike of Olga Marie Animusphere, viewing her as incompetent and constantly angry. He does think she held up well with everything despite her personality, thinking that they should have been more considerate of her circumstances and feeling sorry over the current state of Chaldea as of Goredolf Musik's takeover. As a normal human, he dislikes when "upstart mage jerks" make particular comments. He has come to view Chaldea as his home after spending fifteen years there.

Potrof is a Spirit Guardian of the Heart Kingdom.

Reyhiem, an archbishop of the Western Holy Church, was the most powerful religious figure in the Kingdom of Falmuth. He was (on paper, at least) on equal footing with the king himself given Falmuth's adoption of Luminism as its state religion. That was just a formality, however; in reality, Reyhiem was more of a trusted right-hand man, taking his cues from the king.

Is a Shinjuku-based troublemaker who specializes in arson. ~!Per Chapter 51, Fire-Breathing Bug has been confirmed to encompass multiple people and cannot merely be defined as a mere individual. !~

Loris is one of Maalt Town citizens, proprietor of the eatery named Red Wyvern Pavilion, and a rookie adventurer whom Rentt meets in the labyrinth.

Jakumen is a Martial Artist and user of the Giga Pro Wrestling.

Gyoffrey is a Mysterious Being and a member of the Monster Association.

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Hayato Fujii

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