TV-Series
Description
Fizel, designated Fizel Synthesis Twenty-Nine, ranks among the youngest Integrity Knights in the Axiom Church's Order. Her short straw-colored hair frames upward-slanting eyes that radiate resolve. She dons an ink-black uniform, mirroring her partner Linel, complete with a green belt securing short swords akin to daggers—each approximately thirty cen in length with reddish wood grips.

Unlike most Human Empire children who receive their Sacred Task at age ten, Fizel was assigned hers at five. This task plunged her into a brutal experiment by Administrator, where she and Linel joined thirty children compelled to kill one another repeatedly. Administrator revived the fallen, but resurrections often triggered memory loss, personality shifts, or physical deformities. To curb these side effects, Fizel and Linel perfected clean kills via single strikes to the heart or head. When they stood as the last survivors, Administrator halted the experiment and permitted them to select a new Sacred Task. Both opted to become Integrity Knights, yet Chief Elder Chudelkin denied their request. To demonstrate their worth, they slew the prior Synthesis Twenty-Eight and Twenty-Nine knights in combat, compelling Administrator to accept them as apprentices.

During the Alicization conflict, Fizel and Linel detected intruders from the Dark Territory within the Axiom Church. Eager for promotion to full knights, they schemed to capture and execute the intruders—Kirito and Eugeo—before witnesses. Posing as sister apprentices, they paralyzed the duo with poisoned blades and conveyed them to the 50th floor while narrating their origins. Kirito, however, secretly resisted the toxin and later paralyzed the pair with their own blades during his skirmish with other knights. Afterward, Kirito dispensed the antidote, shattered their venomous weapons, and verified they carried no further arms.

Subsequently, Fizel and Linel enlisted in the Human Empire's war against the Dark Territory. Their involvement arose from a quest to grasp the convictions that animated Kirito and Eugeo, especially concerning mental resilience and purpose in battle. Fizel's dragon mount answers to Himawari.

As Integrity Knights, Fizel and Linel uniquely preserve their human memories. Neither were Unity Tournament champions nor Taboo Index violators subjected to memory-erasing Synthesis Rituals, enabling them to retain full recollection of their past and endured experiments.