Koinzell is a new name taken by one of the falsely-labeled Lances of Betrayal, Ascheriit. Back in his youth he was an orphan who was accepted as a student in Ms. Gleaa&#039;s school of swordsmanship, where he accomplished such feats, especially the learning of the infamous Black Wing sword technique, that made him the new heir of the title of Blade Master, an ancient honour for those deemed true master swordsmen. He then became one of the fourteen youths chosen to carry the Emperor&#039;s spears and end the war with Wischtech, and was also one of the four to accomplish their mission, only to be betrayed and brutally murdered by their fellow companions, those who became known as the Seven Heroes. After having his left eye gouged out by Glenn, his best friend, and his body minced to pieces, he was left for dead but managed to survive by feeding on a fairy, which regenerated him at the expense of mixing his human blood with that of the faeries, thus giving him the appearance of a feminine child with pale hair and skin and red eyes. Koinzell is regarded as one of the best fighters in the series, due to not only to his swordsmanship, which include the fabled Black Wing, but also because he can create massive black chainswords from his right wrist. He is shown to be usually cold, and very brutal and ruthless when hunting down those who betrayed him, but can also be very caring, often putting himself at risk for others. That is due to that although revenge motivates him, he is still the hero which he was before being betrayed by his friends. He is empowered by the twin moons of the world, and if too fatigued he shrinks into a child fairy until recovered.

Rumors stir throughout the land: when the wielder of the black sword draws his dark blade, all who stand in its path are torn asunder…! 
Köinzell, the mysterious young boy who carries the black sword, undeniably wields it with exceptional skill, but can he truly be responsible for the bloody rumors?
Pursued by the Traitorous Lances, four powerful warriors who were thought to have been defeated by the Seven Heroes, the strength of the young swordsman will be tested to its limit. At battle’s end, only the shocking truth of Köinzell’s quest will stand above the corpses of his enemies… 
An epic fantasy on the grandest of scales! 

(Source: Yen Press)

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On January 1st 2025, he announced that he had gotten married to a women outside of the entertainment industry.

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Gabriel Martins Oliveira da Costa is a Brazilian actor and voice actor.

__Non-Anime Roles:__
~!- Griffin Gluck (Most of the productions)
- Luke Castellan (Percy Jackson and the Olympians)
- Rubble (Paw Patrol)
- Adam F. Goldberg (2nd voice; The Goldbergs)
- Parker Rooney (Liv and Maddie)
- Richie Rich (Richie Rich 2015)
- Jeremy Birnbaum (Star vs. the Forces of Evil)
- Jack Champion (Avatar: The Way of Water and Scream 6)
- Dae-heon Kim (To All the Boys: Always and Forever and XO, Kitty)
- Young Kakashi Hatake (Naruto X Boruto: Ultimate Ninja Storm Connections)
- Child Vinsmoke Sanji (One Piece Live Action)
- Ethan Morales (Never Have I Ever...)
- Child Nathan "Nate" Drake (Uncharted 4: A Thief's End)
!~

Rumors stir throughout the land: when the wielder of the black sword draws his dark blade, all who stand in its path are torn asunder...!
 
Köinzell, the mysterious young boy who carries the black sword, undeniably wields it with exceptional skill, but can he truly be responsible for the bloody rumors? Pursued by the Traitorous Lances, four powerful warriors who were thought to have been defeated by the Seven Heroes, the strength of the young swordsman will be tested to its limit. At battle's end, only the shocking truth of Köinzell's quest will stand above the corpses of his enemies...
 
An epic fantasy on the grandest of scales!
 
(Source: Yen Press)

Set one year after the war with Glenn, Elseria, who is now crowned emperor, tries to stabilize the kingdom, filled with dissidents, and in that is helped by Köinzell, now Lord Viceroy Ascheriit,alongside the imperial general Geranpen, his chief official Ato and Ikfes, the swordsmith, known as Blattmaster. In southern part of the empire, Helenhild, a remote area,a new threat, a resistance force made up of remnant loyalists of Glenn, called "Knights of the Dead King", who believe in his eventual resurrection, have started to act up and sow seeds of unrest.
 
The fates of Köinzell and the Seven Heroes become intertwined again, as the second act of this dark fantasy revenge saga, begins to unfold now............. 
(Source: Square Enix, translated & adapted)