Fizel

Fizel (フィゼル), also known as Fizel Synthesis Twenty-Nine (フィゼル・シンセシス・トゥエニナイン), is an Integrity Knight and likely the youngest one, along with Linel.

Appearance
Fizel has straw-colored hair in a short cut, with her two eyes accented upwards. She's described as having an expression of resolve. She wears and ink-black uniform, identical to Linel's. Her uniform has a green belt, with short-swords attached, close to the length of a dagger, at 30 «cen», with a grip made of reddish wood.

Background
Unlike most children, she and Linel received their Sacred Task at the age of 5, instead of 10. Their task was to perform in an experiment by Administrator, where she was partnered with Linel, along with 28 other children, and forced to kill each other. In these experiments, Administrator would resurrect any child who died, and had them continue the experiment. Fizel admitted to having forgotten many days worth of memories after a resurrection. Other side-effects included people returning as "different people", and some just returned as lumps of meat. Fizel and Linel discovered that killing someone in a single hit increased the likelihood of a successful resurrection, so they trained themselves in the proficiency of killing each other cleanly in a single hit, by striking at each other's heart and head.

When only these two were left, Administrator gave up on her experiment, and allowed the girls to choose their next Sacred Task. Both chose to be Integrity Knights, but one of the high-ministers rejected them, so they proved themselves by killing the previous Synthesis Twenty-Eight, and Synthesis Twenty-Nine. After doing so, Administrator made them a special case, and allowed them to become Integrity Knight trainees.

Alicization Rising
After hearing that there were intruders from the Dark Territory in the Axiom Church, the two decided to prove themselves as real Integrity Knights by killing the intruders themselves, in front of the other Knights. They planned to fool Kirito and Eugeo, by pretending to be "sister apprentices" of the Axiom Church. However, as soon as they came into range, they used their poisoned swords to paralyze the duo and, afterwards, dragged them to the 50th floor while telling them their back-story.

After arriving at the 50th floor, Fizel showed the five knights guarding this floor, the two intruders they captured, and began to argue with Fanatio. Meanwhile, Kirito, who had managed to figure out what the girls were planning and chant a poison countering Sacred Art while Eugeo was talking to the girls, stealthily approached Fizel and Linel from behind and used their own poisonous blades to paralyze the girls. The two girls were left paralyzed during Kirito's fight with the five Integrity Knights in the room to watch the battle. After the battle, Kirito gave the antidote to Eugeo to cure the girls' paralysis, after destroying their poisonous blades and checking for anything else suspicious that they might have.

Trivia

 * In the web-version, Fizel was a male Integrity Knight named Bisuten Thirty-nine.
 * Along with Linel, she is the only known Integrity Knight who was not a past Four Empires Unity Tournament winner, nor a criminal who broke the Taboo Index. Because of this, the girls remember their past as humans, and do not have the illusion of having descended from the Celestial World.
 * Unlike most children, Fizel was given her Sacred Task at the age of 5, instead of 10.

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