Mokkania Fluru ranks among the Bantorra Library's top five combatants, wielding formidable power as an Armed Librarian. His magic commands vast swarms of flesh-devouring ants, a devastating ability turned source of profound psychological torment. After deploying this power to annihilate an enemy army during the conflict between the Bantorra Library and The Empire, overwhelming guilt and remorse consumed him. The weight of the lives he extinguished drove him to self-imposed isolation deep within the library's labyrinth, specifically a locked room on the fifth floor. Fear of his own destructive potential and the ease of causing mass death transformed him into a hikikomori, burdened by his capabilities and dreading further harm.

Having died prior to the final confrontation, Mokkania was later summoned within Ruruta Coozancoona's mindscape. Hamyuts Meseta utilized her "Book Eating" ability to manifest the souls and forms of the deceased, including Mokkania and other fallen comrades, for the decisive battle against the primary antagonist. This posthumous summoning represented a final deployment of his strength for the library's cause, resulting in the permanent destruction of his soul as part of Hamyuts's power cost. His participation in the pivotal engagement against The Empire, where his actions proved catastrophic, defined his path toward isolation and this ultimate fate.