Zero is one
of the higher-ranked agents of "NESTS" and he
supervised the creation of Krizalid.
The designer, C.A.C Yamasaki, admits basing Zero off a certain character from
the manga Fist of the North Star. He begins to secretly build his own
weapon from NESTS' technology called the "Zero Cannon", setting it to
operate. He sets his plans into motion in The King of Fighters 2000. There, he
impersonates a military commander named Ling and uses his persona as a decoy to
stop the military resistance against him. Depending on the actions of the
player, his plans are foiled by either Heidern
or Kula, who is sent to execute him for
his treacherous acts.
The Zero in The King
of Fighters 2000 is revealed to be a clone from the Original
Zero, Zero, who
appears as a sub-boss in The King of Fighters 2001. He was created
because the supervising designer to his character claimed to be dissatisfied
with Zero's design in 2000. Unlike his clone, Zero is extremely loyal to the
NESTS syndicate and was disgusted to learn of his clone's attempted coup d'état.
Willing to clear his reputation of his clone's actions, Zero is commanded to
destroy the winners of The King of Fighters tournament. He traps the winning
team in a space ship that was disguised as a blimp. When he is defeated, he
urges the team to escape the collapsing ship and dies on board the vessel. The
original Zero is voiced by Toshimitsu Arai, while the clone is voiced by Kinta Futogane.