TV-Series
Description
Zeero Jr., son of Ze-ro and Planetta, emerged in the human world months before Prince Smile's tournament, hurtling to Earth within a desert meteorite. Known as the enigmatic "black duelist," his appearance mirrors a younger, shorter version of his father, distinguished by deep blue hair, a cape replacing black, and human-like turquoise eyes instead of Ze-ro's blank gaze.

He exhibits a cold, aloof, and detached personality, contrasting sharply with his father's overt delight in brutal victories. Prince Smile earns his open annoyance, deemed "annoying," while figures like Joe Kirifuda receive only rudeness or silence. His core motivation is vengeance against Joe Kirifuda, whom he blames for Ze-ro's defeat and death in the creature world wars.

Initially appearing as an unnamed silhouette terrorizing duelists, he captured Prince Smile's interest, leading to a special invitation to the worldwide tournament. Rumored as the "Duelist with the Black Card," his presence instilled widespread fear among participants. During the finals, he deployed his signature Genmu Emperor, Illusionary Dragon, locking Prince Smile's deck and visibly destabilizing the usually composed prince. Though Abaku Onifuda was impressed and attempted recruitment, Zeero Jr. rejected the offer.

Later, he confronted Joe Kirifuda directly after covert observation. Incapacitating Joe with a power surge, he transported him to an abandoned warehouse for a duel. There, he revealed his identity as Ze-ro's son, declaring the duel an act of personal vengeance. Summoning Genmu Emperor, Infinite Dragon shattered all of Joe's shields. However, Joe's strategic use of Ganbare! Ganbungee and Monoking secured Zeero Jr.'s defeat.

Following his loss, he reluctantly intervened to save Deckie, forcing the expulsion of a poisonous red mushroom the creature had ingested. Despite this act, he emphasized his presence was solely to defeat Joe, disassociated himself from the tournament, and departed.

His deck utilizes Water and Darkness civilizations, centering on the Mafi Gang and Team Zero archetypes. Genmu Emperor, Infinite Dragon serves as his King Master Card. An official deck based on this strategy is available through Takaratomy's resources.